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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) 2012 Red Hat4 */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 20static 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 34static 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 41static 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 */56static 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 67DEFINE_DRM_GEM_FOPS(udl_driver_fops);68 69static 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 85static 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 104static 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 125static 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 chips140 */141static 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};151MODULE_DEVICE_TABLE(usb, id_table);152 153static 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};162module_usb_driver(udl_driver);163MODULE_DESCRIPTION("KMS driver for the USB displaylink video adapters");164MODULE_LICENSE("GPL");165