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_drv.h> 9 #include <drm/drm_fbdev_shmem.h> 10 #include <drm/drm_file.h> 11 #include <drm/drm_gem_shmem_helper.h> 12 #include <drm/drm_managed.h> 13 #include <drm/drm_modeset_helper.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 int ret; 25 26 ret = drm_mode_config_helper_suspend(dev); 27 if (ret) 28 return ret; 29 30 udl_sync_pending_urbs(dev); 31 return 0; 32 } 33 34 static int udl_usb_resume(struct usb_interface *interface) 35 { 36 struct drm_device *dev = usb_get_intfdata(interface); 37 38 return drm_mode_config_helper_resume(dev); 39 } 40 41 static int udl_usb_reset_resume(struct usb_interface *interface) 42 { 43 struct drm_device *dev = usb_get_intfdata(interface); 44 struct udl_device *udl = to_udl(dev); 45 46 udl_select_std_channel(udl); 47 48 return drm_mode_config_helper_resume(dev); 49 } 50 51 /* 52 * FIXME: Dma-buf sharing requires DMA support by the importing device. 53 * This function is a workaround to make USB devices work as well. 54 * See todo.rst for how to fix the issue in the dma-buf framework. 55 */ 56 static struct drm_gem_object *udl_driver_gem_prime_import(struct drm_device *dev, 57 struct dma_buf *dma_buf) 58 { 59 struct udl_device *udl = to_udl(dev); 60 61 if (!udl->dmadev) 62 return ERR_PTR(-ENODEV); 63 64 return drm_gem_prime_import_dev(dev, dma_buf, udl->dmadev); 65 } 66 67 DEFINE_DRM_GEM_FOPS(udl_driver_fops); 68 69 static const struct drm_driver driver = { 70 .driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET, 71 72 /* GEM hooks */ 73 .fops = &udl_driver_fops, 74 DRM_GEM_SHMEM_DRIVER_OPS, 75 .gem_prime_import = udl_driver_gem_prime_import, 76 77 .name = DRIVER_NAME, 78 .desc = DRIVER_DESC, 79 .date = DRIVER_DATE, 80 .major = DRIVER_MAJOR, 81 .minor = DRIVER_MINOR, 82 .patchlevel = DRIVER_PATCHLEVEL, 83 }; 84 85 static struct udl_device *udl_driver_create(struct usb_interface *interface) 86 { 87 struct udl_device *udl; 88 int r; 89 90 udl = devm_drm_dev_alloc(&interface->dev, &driver, 91 struct udl_device, drm); 92 if (IS_ERR(udl)) 93 return udl; 94 95 r = udl_init(udl); 96 if (r) 97 return ERR_PTR(r); 98 99 usb_set_intfdata(interface, udl); 100 101 return udl; 102 } 103 104 static int udl_usb_probe(struct usb_interface *interface, 105 const struct usb_device_id *id) 106 { 107 int r; 108 struct udl_device *udl; 109 110 udl = udl_driver_create(interface); 111 if (IS_ERR(udl)) 112 return PTR_ERR(udl); 113 114 r = drm_dev_register(&udl->drm, 0); 115 if (r) 116 return r; 117 118 DRM_INFO("Initialized udl on minor %d\n", udl->drm.primary->index); 119 120 drm_fbdev_shmem_setup(&udl->drm, 0); 121 122 return 0; 123 } 124 125 static void udl_usb_disconnect(struct usb_interface *interface) 126 { 127 struct drm_device *dev = usb_get_intfdata(interface); 128 129 drm_kms_helper_poll_fini(dev); 130 udl_drop_usb(dev); 131 drm_dev_unplug(dev); 132 } 133 134 /* 135 * There are many DisplayLink-based graphics products, all with unique PIDs. 136 * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff) 137 * We also require a match on SubClass (0x00) and Protocol (0x00), 138 * which is compatible with all known USB 2.0 era graphics chips and firmware, 139 * but allows DisplayLink to increment those for any future incompatible chips 140 */ 141 static const struct usb_device_id id_table[] = { 142 {.idVendor = 0x17e9, .bInterfaceClass = 0xff, 143 .bInterfaceSubClass = 0x00, 144 .bInterfaceProtocol = 0x00, 145 .match_flags = USB_DEVICE_ID_MATCH_VENDOR | 146 USB_DEVICE_ID_MATCH_INT_CLASS | 147 USB_DEVICE_ID_MATCH_INT_SUBCLASS | 148 USB_DEVICE_ID_MATCH_INT_PROTOCOL,}, 149 {}, 150 }; 151 MODULE_DEVICE_TABLE(usb, id_table); 152 153 static struct usb_driver udl_driver = { 154 .name = "udl", 155 .probe = udl_usb_probe, 156 .disconnect = udl_usb_disconnect, 157 .suspend = udl_usb_suspend, 158 .resume = udl_usb_resume, 159 .reset_resume = udl_usb_reset_resume, 160 .id_table = id_table, 161 }; 162 module_usb_driver(udl_driver); 163 MODULE_DESCRIPTION("KMS driver for the USB displaylink video adapters"); 164 MODULE_LICENSE("GPL"); 165