LXR linux/drivers/gpu/drm/udl/udl

   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
  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
  25        return drm_mode_config_helper_suspend(dev);
  26}
  27
  28static 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 */
  40static 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
  51DEFINE_DRM_GEM_FOPS(udl_driver_fops);
  52
  53static 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
  69static 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
  88static 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
 109static 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 */
 125static 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};
 135MODULE_DEVICE_TABLE(usb, id_table);
 136
 137static 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};
 145module_usb_driver(udl_driver);
 146MODULE_LICENSE("GPL");
 147