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_generic.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_generic_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 chips
140 */
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_LICENSE("GPL");