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 const struct drm_driver driver = { 38 .driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET, 39 40 /* GEM hooks */ 41 .fops = &udl_driver_fops, 42 DRM_GEM_SHMEM_DRIVER_OPS, 43 44 .name = DRIVER_NAME, 45 .desc = DRIVER_DESC, 46 .date = DRIVER_DATE, 47 .major = DRIVER_MAJOR, 48 .minor = DRIVER_MINOR, 49 .patchlevel = DRIVER_PATCHLEVEL, 50 }; 51 52 static struct udl_device *udl_driver_create(struct usb_interface *interface) 53 { 54 struct udl_device *udl; 55 int r; 56 57 udl = devm_drm_dev_alloc(&interface->dev, &driver, 58 struct udl_device, drm); 59 if (IS_ERR(udl)) 60 return udl; 61 62 r = udl_init(udl); 63 if (r) 64 return ERR_PTR(r); 65 66 usb_set_intfdata(interface, udl); 67 68 return udl; 69 } 70 71 static int udl_usb_probe(struct usb_interface *interface, 72 const struct usb_device_id *id) 73 { 74 int r; 75 struct udl_device *udl; 76 77 udl = udl_driver_create(interface); 78 if (IS_ERR(udl)) 79 return PTR_ERR(udl); 80 81 r = drm_dev_register(&udl->drm, 0); 82 if (r) 83 return r; 84 85 DRM_INFO("Initialized udl on minor %d\n", udl->drm.primary->index); 86 87 drm_fbdev_generic_setup(&udl->drm, 0); 88 89 return 0; 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_fini(dev); 97 udl_drop_usb(dev); 98 drm_dev_unplug(dev); 99 } 100 101 /* 102 * There are many DisplayLink-based graphics products, all with unique PIDs. 103 * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff) 104 * We also require a match on SubClass (0x00) and Protocol (0x00), 105 * which is compatible with all known USB 2.0 era graphics chips and firmware, 106 * but allows DisplayLink to increment those for any future incompatible chips 107 */ 108 static const struct usb_device_id id_table[] = { 109 {.idVendor = 0x17e9, .bInterfaceClass = 0xff, 110 .bInterfaceSubClass = 0x00, 111 .bInterfaceProtocol = 0x00, 112 .match_flags = USB_DEVICE_ID_MATCH_VENDOR | 113 USB_DEVICE_ID_MATCH_INT_CLASS | 114 USB_DEVICE_ID_MATCH_INT_SUBCLASS | 115 USB_DEVICE_ID_MATCH_INT_PROTOCOL,}, 116 {}, 117 }; 118 MODULE_DEVICE_TABLE(usb, id_table); 119 120 static struct usb_driver udl_driver = { 121 .name = "udl", 122 .probe = udl_usb_probe, 123 .disconnect = udl_usb_disconnect, 124 .suspend = udl_usb_suspend, 125 .resume = udl_usb_resume, 126 .id_table = id_table, 127 }; 128 module_usb_driver(udl_driver); 129 MODULE_LICENSE("GPL"); 130