| 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"); |