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 /* 36 * FIXME: Dma-buf sharing requires DMA support by the importing device. 37 * This function is a workaround to make USB devices work as well. 38 * See todo.rst for how to fix the issue in the dma-buf framework. 39 */ 40 static struct drm_gem_object *udl_driver_gem_prime_import(struct drm_device *dev, 41 struct dma_buf *dma_buf) 42 { 43 struct udl_device *udl = to_udl(dev); 44 45 if (!udl->dmadev) 46 return ERR_PTR(-ENODEV); 47 48 return drm_gem_prime_import_dev(dev, dma_buf, udl->dmadev); 49 } 50 51 DEFINE_DRM_GEM_FOPS(udl_driver_fops); 52 53 static const struct drm_driver driver = { 54 .driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET, 55 56 /* GEM hooks */ 57 .fops = &udl_driver_fops, 58 DRM_GEM_SHMEM_DRIVER_OPS, 59 .gem_prime_import = udl_driver_gem_prime_import, 60 61 .name = DRIVER_NAME, 62 .desc = DRIVER_DESC, 63 .date = DRIVER_DATE, 64 .major = DRIVER_MAJOR, 65 .minor = DRIVER_MINOR, 66 .patchlevel = DRIVER_PATCHLEVEL, 67 }; 68 69 static struct udl_device *udl_driver_create(struct usb_interface *interface) 70 { 71 struct udl_device *udl; 72 int r; 73 74 udl = devm_drm_dev_alloc(&interface->dev, &driver, 75 struct udl_device, drm); 76 if (IS_ERR(udl)) 77 return udl; 78 79 r = udl_init(udl); 80 if (r) 81 return ERR_PTR(r); 82 83 usb_set_intfdata(interface, udl); 84 85 return udl; 86 } 87 88 static int udl_usb_probe(struct usb_interface *interface, 89 const struct usb_device_id *id) 90 { 91 int r; 92 struct udl_device *udl; 93 94 udl = udl_driver_create(interface); 95 if (IS_ERR(udl)) 96 return PTR_ERR(udl); 97 98 r = drm_dev_register(&udl->drm, 0); 99 if (r) 100 return r; 101 102 DRM_INFO("Initialized udl on minor %d\n", udl->drm.primary->index); 103 104 drm_fbdev_generic_setup(&udl->drm, 0); 105 106 return 0; 107 } 108 109 static void udl_usb_disconnect(struct usb_interface *interface) 110 { 111 struct drm_device *dev = usb_get_intfdata(interface); 112 113 drm_kms_helper_poll_fini(dev); 114 udl_drop_usb(dev); 115 drm_dev_unplug(dev); 116 } 117 118 /* 119 * There are many DisplayLink-based graphics products, all with unique PIDs. 120 * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff) 121 * We also require a match on SubClass (0x00) and Protocol (0x00), 122 * which is compatible with all known USB 2.0 era graphics chips and firmware, 123 * but allows DisplayLink to increment those for any future incompatible chips 124 */ 125 static const struct usb_device_id id_table[] = { 126 {.idVendor = 0x17e9, .bInterfaceClass = 0xff, 127 .bInterfaceSubClass = 0x00, 128 .bInterfaceProtocol = 0x00, 129 .match_flags = USB_DEVICE_ID_MATCH_VENDOR | 130 USB_DEVICE_ID_MATCH_INT_CLASS | 131 USB_DEVICE_ID_MATCH_INT_SUBCLASS | 132 USB_DEVICE_ID_MATCH_INT_PROTOCOL,}, 133 {}, 134 }; 135 MODULE_DEVICE_TABLE(usb, id_table); 136 137 static struct usb_driver udl_driver = { 138 .name = "udl", 139 .probe = udl_usb_probe, 140 .disconnect = udl_usb_disconnect, 141 .suspend = udl_usb_suspend, 142 .resume = udl_usb_resume, 143 .id_table = id_table, 144 }; 145 module_usb_driver(udl_driver); 146 MODULE_LICENSE("GPL"); 147