1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2012 Red Hat 4 */ 5 6 #include <linux/module.h> 7 8 #include <drm/drm_crtc_helper.h> 9 #include <drm/drm_drv.h> 10 #include <drm/drm_fb_helper.h> 11 #include <drm/drm_file.h> 12 #include <drm/drm_gem_shmem_helper.h> 13 #include <drm/drm_managed.h> 14 #include <drm/drm_ioctl.h> 15 #include <drm/drm_probe_helper.h> 16 #include <drm/drm_print.h> 17 18 #include "udl_drv.h" 19 20 static int udl_usb_suspend(struct usb_interface *interface, 21 pm_message_t message) 22 { 23 struct drm_device *dev = usb_get_intfdata(interface); 24 25 return drm_mode_config_helper_suspend(dev); 26 } 27 28 static int udl_usb_resume(struct usb_interface *interface) 29 { 30 struct drm_device *dev = usb_get_intfdata(interface); 31 32 return drm_mode_config_helper_resume(dev); 33 } 34 35 DEFINE_DRM_GEM_FOPS(udl_driver_fops); 36 37 static struct drm_driver driver = { 38 .driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET, 39 40 /* GEM hooks */ 41 .gem_create_object = drm_gem_shmem_create_object_cached, 42 43 .fops = &udl_driver_fops, 44 DRM_GEM_SHMEM_DRIVER_OPS, 45 46 .name = DRIVER_NAME, 47 .desc = DRIVER_DESC, 48 .date = DRIVER_DATE, 49 .major = DRIVER_MAJOR, 50 .minor = DRIVER_MINOR, 51 .patchlevel = DRIVER_PATCHLEVEL, 52 }; 53 54 static struct udl_device *udl_driver_create(struct usb_interface *interface) 55 { 56 struct usb_device *udev = interface_to_usbdev(interface); 57 struct udl_device *udl; 58 int r; 59 60 udl = devm_drm_dev_alloc(&interface->dev, &driver, 61 struct udl_device, drm); 62 if (IS_ERR(udl)) 63 return udl; 64 65 udl->udev = udev; 66 67 r = udl_init(udl); 68 if (r) 69 return ERR_PTR(r); 70 71 usb_set_intfdata(interface, udl); 72 73 return udl; 74 } 75 76 static int udl_usb_probe(struct usb_interface *interface, 77 const struct usb_device_id *id) 78 { 79 int r; 80 struct udl_device *udl; 81 82 udl = udl_driver_create(interface); 83 if (IS_ERR(udl)) 84 return PTR_ERR(udl); 85 86 r = drm_dev_register(&udl->drm, 0); 87 if (r) 88 return r; 89 90 DRM_INFO("Initialized udl on minor %d\n", udl->drm.primary->index); 91 92 drm_fbdev_generic_setup(&udl->drm, 0); 93 94 return 0; 95 } 96 97 static void udl_usb_disconnect(struct usb_interface *interface) 98 { 99 struct drm_device *dev = usb_get_intfdata(interface); 100 101 drm_kms_helper_poll_fini(dev); 102 udl_drop_usb(dev); 103 drm_dev_unplug(dev); 104 } 105 106 /* 107 * There are many DisplayLink-based graphics products, all with unique PIDs. 108 * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff) 109 * We also require a match on SubClass (0x00) and Protocol (0x00), 110 * which is compatible with all known USB 2.0 era graphics chips and firmware, 111 * but allows DisplayLink to increment those for any future incompatible chips 112 */ 113 static const struct usb_device_id id_table[] = { 114 {.idVendor = 0x17e9, .bInterfaceClass = 0xff, 115 .bInterfaceSubClass = 0x00, 116 .bInterfaceProtocol = 0x00, 117 .match_flags = USB_DEVICE_ID_MATCH_VENDOR | 118 USB_DEVICE_ID_MATCH_INT_CLASS | 119 USB_DEVICE_ID_MATCH_INT_SUBCLASS | 120 USB_DEVICE_ID_MATCH_INT_PROTOCOL,}, 121 {}, 122 }; 123 MODULE_DEVICE_TABLE(usb, id_table); 124 125 static struct usb_driver udl_driver = { 126 .name = "udl", 127 .probe = udl_usb_probe, 128 .disconnect = udl_usb_disconnect, 129 .suspend = udl_usb_suspend, 130 .resume = udl_usb_resume, 131 .id_table = id_table, 132 }; 133 module_usb_driver(udl_driver); 134 MODULE_LICENSE("GPL"); 135