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_client_setup.h>
 10#include <drm/drm_fbdev_shmem.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_modeset_helper.h>
 15#include <drm/drm_ioctl.h>
 16#include <drm/drm_probe_helper.h>
 17#include <drm/drm_print.h>
 18
 19#include "udl_drv.h"
 20
 21static int udl_usb_suspend(struct usb_interface *interface,
 22			   pm_message_t message)
 23{
 24	struct drm_device *dev = usb_get_intfdata(interface);
 25	int ret;
 26
 27	ret = drm_mode_config_helper_suspend(dev);
 28	if (ret)
 29		return ret;
 30
 31	udl_sync_pending_urbs(dev);
 32	return 0;
 33}
 34
 35static int udl_usb_resume(struct usb_interface *interface)
 36{
 37	struct drm_device *dev = usb_get_intfdata(interface);
 38
 39	return drm_mode_config_helper_resume(dev);
 40}
 41
 42static int udl_usb_reset_resume(struct usb_interface *interface)
 43{
 44	struct drm_device *dev = usb_get_intfdata(interface);
 45	struct udl_device *udl = to_udl(dev);
 46
 47	udl_select_std_channel(udl);
 48
 49	return drm_mode_config_helper_resume(dev);
 50}
 51
 52/*
 53 * FIXME: Dma-buf sharing requires DMA support by the importing device.
 54 *        This function is a workaround to make USB devices work as well.
 55 *        See todo.rst for how to fix the issue in the dma-buf framework.
 56 */
 57static struct drm_gem_object *udl_driver_gem_prime_import(struct drm_device *dev,
 58							  struct dma_buf *dma_buf)
 59{
 60	struct udl_device *udl = to_udl(dev);
 61
 62	if (!udl->dmadev)
 63		return ERR_PTR(-ENODEV);
 64
 65	return drm_gem_prime_import_dev(dev, dma_buf, udl->dmadev);
 66}
 67
 68DEFINE_DRM_GEM_FOPS(udl_driver_fops);
 69
 70static const struct drm_driver driver = {
 71	.driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
 72
 73	/* GEM hooks */
 74	.fops = &udl_driver_fops,
 75	DRM_GEM_SHMEM_DRIVER_OPS,
 76	.gem_prime_import = udl_driver_gem_prime_import,
 77	DRM_FBDEV_SHMEM_DRIVER_OPS,
 78
 79	.name = DRIVER_NAME,
 80	.desc = DRIVER_DESC,
 81	.date = DRIVER_DATE,
 82	.major = DRIVER_MAJOR,
 83	.minor = DRIVER_MINOR,
 84	.patchlevel = DRIVER_PATCHLEVEL,
 85};
 86
 87static struct udl_device *udl_driver_create(struct usb_interface *interface)
 88{
 89	struct udl_device *udl;
 90	int r;
 91
 92	udl = devm_drm_dev_alloc(&interface->dev, &driver,
 93				 struct udl_device, drm);
 94	if (IS_ERR(udl))
 95		return udl;
 96
 97	r = udl_init(udl);
 98	if (r)
 99		return ERR_PTR(r);
100
101	usb_set_intfdata(interface, udl);
102
103	return udl;
104}
105
106static int udl_usb_probe(struct usb_interface *interface,
107			 const struct usb_device_id *id)
108{
109	int r;
110	struct udl_device *udl;
111
112	udl = udl_driver_create(interface);
113	if (IS_ERR(udl))
114		return PTR_ERR(udl);
115
116	r = drm_dev_register(&udl->drm, 0);
117	if (r)
118		return r;
119
120	DRM_INFO("Initialized udl on minor %d\n", udl->drm.primary->index);
121
122	drm_client_setup(&udl->drm, NULL);
123
124	return 0;
125}
126
127static void udl_usb_disconnect(struct usb_interface *interface)
128{
129	struct drm_device *dev = usb_get_intfdata(interface);
130
131	drm_kms_helper_poll_fini(dev);
132	udl_drop_usb(dev);
133	drm_dev_unplug(dev);
134}
135
136/*
137 * There are many DisplayLink-based graphics products, all with unique PIDs.
138 * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
139 * We also require a match on SubClass (0x00) and Protocol (0x00),
140 * which is compatible with all known USB 2.0 era graphics chips and firmware,
141 * but allows DisplayLink to increment those for any future incompatible chips
142 */
143static const struct usb_device_id id_table[] = {
144	{.idVendor = 0x17e9, .bInterfaceClass = 0xff,
145	 .bInterfaceSubClass = 0x00,
146	 .bInterfaceProtocol = 0x00,
147	 .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
148			USB_DEVICE_ID_MATCH_INT_CLASS |
149			USB_DEVICE_ID_MATCH_INT_SUBCLASS |
150			USB_DEVICE_ID_MATCH_INT_PROTOCOL,},
151	{},
152};
153MODULE_DEVICE_TABLE(usb, id_table);
154
155static struct usb_driver udl_driver = {
156	.name = "udl",
157	.probe = udl_usb_probe,
158	.disconnect = udl_usb_disconnect,
159	.suspend = udl_usb_suspend,
160	.resume = udl_usb_resume,
161	.reset_resume = udl_usb_reset_resume,
162	.id_table = id_table,
163};
164module_usb_driver(udl_driver);
165MODULE_DESCRIPTION("KMS driver for the USB displaylink video adapters");
166MODULE_LICENSE("GPL");