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Linux/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 int udl_usb_suspend(struct usb_interface *interface,
 20                            pm_message_t message)
 21 {
 22         return 0;
 23 }
 24 
 25 static int udl_usb_resume(struct usb_interface *interface)
 26 {
 27         struct drm_device *dev = usb_get_intfdata(interface);
 28 
 29         udl_modeset_restore(dev);
 30         return 0;
 31 }
 32 
 33 static const struct vm_operations_struct udl_gem_vm_ops = {
 34         .fault = udl_gem_fault,
 35         .open = drm_gem_vm_open,
 36         .close = drm_gem_vm_close,
 37 };
 38 
 39 static const struct file_operations udl_driver_fops = {
 40         .owner = THIS_MODULE,
 41         .open = drm_open,
 42         .mmap = udl_drm_gem_mmap,
 43         .poll = drm_poll,
 44         .read = drm_read,
 45         .unlocked_ioctl = drm_ioctl,
 46         .release = drm_release,
 47         .compat_ioctl = drm_compat_ioctl,
 48         .llseek = noop_llseek,
 49 };
 50 
 51 static struct drm_driver driver = {
 52         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
 53         .load = udl_driver_load,
 54         .unload = udl_driver_unload,
 55         .set_busid = udl_driver_set_busid,
 56 
 57         /* gem hooks */
 58         .gem_free_object = udl_gem_free_object,
 59         .gem_vm_ops = &udl_gem_vm_ops,
 60 
 61         .dumb_create = udl_dumb_create,
 62         .dumb_map_offset = udl_gem_mmap,
 63         .dumb_destroy = drm_gem_dumb_destroy,
 64         .fops = &udl_driver_fops,
 65 
 66         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 67         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 68         .gem_prime_export = udl_gem_prime_export,
 69         .gem_prime_import = udl_gem_prime_import,
 70 
 71         .name = DRIVER_NAME,
 72         .desc = DRIVER_DESC,
 73         .date = DRIVER_DATE,
 74         .major = DRIVER_MAJOR,
 75         .minor = DRIVER_MINOR,
 76         .patchlevel = DRIVER_PATCHLEVEL,
 77 };
 78 
 79 static int udl_usb_probe(struct usb_interface *interface,
 80                          const struct usb_device_id *id)
 81 {
 82         struct usb_device *udev = interface_to_usbdev(interface);
 83         struct drm_device *dev;
 84         int r;
 85 
 86         dev = drm_dev_alloc(&driver, &interface->dev);
 87         if (IS_ERR(dev))
 88                 return PTR_ERR(dev);
 89 
 90         r = drm_dev_register(dev, (unsigned long)udev);
 91         if (r)
 92                 goto err_free;
 93 
 94         usb_set_intfdata(interface, dev);
 95         DRM_INFO("Initialized udl on minor %d\n", dev->primary->index);
 96 
 97         return 0;
 98 
 99 err_free:
100         drm_dev_unref(dev);
101         return r;
102 }
103 
104 static void udl_usb_disconnect(struct usb_interface *interface)
105 {
106         struct drm_device *dev = usb_get_intfdata(interface);
107 
108         drm_kms_helper_poll_disable(dev);
109         udl_fbdev_unplug(dev);
110         udl_drop_usb(dev);
111         drm_unplug_dev(dev);
112 }
113 
114 /*
115  * There are many DisplayLink-based graphics products, all with unique PIDs.
116  * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
117  * We also require a match on SubClass (0x00) and Protocol (0x00),
118  * which is compatible with all known USB 2.0 era graphics chips and firmware,
119  * but allows DisplayLink to increment those for any future incompatible chips
120  */
121 static struct usb_device_id id_table[] = {
122         {.idVendor = 0x17e9, .bInterfaceClass = 0xff,
123          .bInterfaceSubClass = 0x00,
124          .bInterfaceProtocol = 0x00,
125          .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
126                         USB_DEVICE_ID_MATCH_INT_CLASS |
127                         USB_DEVICE_ID_MATCH_INT_SUBCLASS |
128                         USB_DEVICE_ID_MATCH_INT_PROTOCOL,},
129         {},
130 };
131 MODULE_DEVICE_TABLE(usb, id_table);
132 
133 static struct usb_driver udl_driver = {
134         .name = "udl",
135         .probe = udl_usb_probe,
136         .disconnect = udl_usb_disconnect,
137         .suspend = udl_usb_suspend,
138         .resume = udl_usb_resume,
139         .id_table = id_table,
140 };
141 module_usb_driver(udl_driver);
142 MODULE_LICENSE("GPL");
143 

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