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/clients/drm_client_setup.h> 9 #include <drm/drm_drv.h> 10 #include <drm/drm_fbdev_shmem.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_modeset_helper.h> 15 #include <drm/drm_ioctl.h> 16 #include <drm/drm_probe_helper.h> 17 #include <drm/drm_print.h> 18 19 #include "udl_drv.h" 20 21 static int udl_usb_suspend(struct usb_interface *interface, 22 pm_message_t message) 23 { 24 struct drm_device *dev = usb_get_intfdata(interface); 25 struct udl_device *udl = to_udl(dev); 26 int ret; 27 28 ret = drm_mode_config_helper_suspend(dev); 29 if (ret) 30 return ret; 31 32 udl_sync_pending_urbs(udl); 33 return 0; 34 } 35 36 static int udl_usb_resume(struct usb_interface *interface) 37 { 38 struct drm_device *dev = usb_get_intfdata(interface); 39 40 return drm_mode_config_helper_resume(dev); 41 } 42 43 static int udl_usb_reset_resume(struct usb_interface *interface) 44 { 45 struct drm_device *dev = usb_get_intfdata(interface); 46 struct udl_device *udl = to_udl(dev); 47 48 udl_select_std_channel(udl); 49 50 return drm_mode_config_helper_resume(dev); 51 } 52 53 DEFINE_DRM_GEM_FOPS(udl_driver_fops); 54 55 static const struct drm_driver driver = { 56 .driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET, 57 58 /* GEM hooks */ 59 .fops = &udl_driver_fops, 60 DRM_GEM_SHMEM_DRIVER_OPS, 61 DRM_FBDEV_SHMEM_DRIVER_OPS, 62 63 .name = DRIVER_NAME, 64 .desc = DRIVER_DESC, 65 .major = DRIVER_MAJOR, 66 .minor = DRIVER_MINOR, 67 .patchlevel = DRIVER_PATCHLEVEL, 68 }; 69 70 static struct udl_device *udl_driver_create(struct usb_interface *interface) 71 { 72 struct udl_device *udl; 73 int r; 74 75 udl = devm_drm_dev_alloc(&interface->dev, &driver, 76 struct udl_device, drm); 77 if (IS_ERR(udl)) 78 return udl; 79 80 r = udl_init(udl); 81 if (r) 82 return ERR_PTR(r); 83 84 usb_set_intfdata(interface, udl); 85 86 return udl; 87 } 88 89 static int udl_usb_probe(struct usb_interface *interface, 90 const struct usb_device_id *id) 91 { 92 int r; 93 struct udl_device *udl; 94 95 udl = udl_driver_create(interface); 96 if (IS_ERR(udl)) 97 return PTR_ERR(udl); 98 99 r = drm_dev_register(&udl->drm, 0); 100 if (r) 101 return r; 102 103 DRM_INFO("Initialized udl on minor %d\n", udl->drm.primary->index); 104 105 drm_client_setup(&udl->drm, NULL); 106 107 return 0; 108 } 109 110 static void udl_usb_disconnect(struct usb_interface *interface) 111 { 112 struct drm_device *dev = usb_get_intfdata(interface); 113 struct udl_device *udl = to_udl(dev); 114 115 drm_dev_unplug(dev); 116 udl_drop_usb(udl); 117 } 118 119 /* 120 * There are many DisplayLink-based graphics products, all with unique PIDs. 121 * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff) 122 * We also require a match on SubClass (0x00) and Protocol (0x00), 123 * which is compatible with all known USB 2.0 era graphics chips and firmware, 124 * but allows DisplayLink to increment those for any future incompatible chips 125 */ 126 static const struct usb_device_id id_table[] = { 127 {.idVendor = 0x17e9, .bInterfaceClass = 0xff, 128 .bInterfaceSubClass = 0x00, 129 .bInterfaceProtocol = 0x00, 130 .match_flags = USB_DEVICE_ID_MATCH_VENDOR | 131 USB_DEVICE_ID_MATCH_INT_CLASS | 132 USB_DEVICE_ID_MATCH_INT_SUBCLASS | 133 USB_DEVICE_ID_MATCH_INT_PROTOCOL,}, 134 {}, 135 }; 136 MODULE_DEVICE_TABLE(usb, id_table); 137 138 static struct usb_driver udl_driver = { 139 .name = "udl", 140 .probe = udl_usb_probe, 141 .disconnect = udl_usb_disconnect, 142 .suspend = udl_usb_suspend, 143 .resume = udl_usb_resume, 144 .reset_resume = udl_usb_reset_resume, 145 .id_table = id_table, 146 }; 147 module_usb_driver(udl_driver); 148 MODULE_DESCRIPTION("KMS driver for the USB displaylink video adapters"); 149 MODULE_LICENSE("GPL"); 150