drm/udl/udl_drv.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (C) 2012 Red Hat
0004  */
0005
0006 #include <linux/module.h>
0007
0008 #include <drm/drm_crtc_helper.h>
0009 #include <drm/drm_drv.h>
0010 #include <drm/drm_fb_helper.h>
0011 #include <drm/drm_file.h>
0012 #include <drm/drm_gem_shmem_helper.h>
0013 #include <drm/drm_managed.h>
0014 #include <drm/drm_ioctl.h>
0015 #include <drm/drm_probe_helper.h>
0016 #include <drm/drm_print.h>
0017
0018 #include "udl_drv.h"
0019
0020 static int udl_usb_suspend(struct usb_interface *interface,
0021                pm_message_t message)
0022 {
0023     struct drm_device *dev = usb_get_intfdata(interface);
0024
0025     return drm_mode_config_helper_suspend(dev);
0026 }
0027
0028 static int udl_usb_resume(struct usb_interface *interface)
0029 {
0030     struct drm_device *dev = usb_get_intfdata(interface);
0031
0032     return drm_mode_config_helper_resume(dev);
0033 }
0034
0035 /*
0036  * FIXME: Dma-buf sharing requires DMA support by the importing device.
0037  *        This function is a workaround to make USB devices work as well.
0038  *        See todo.rst for how to fix the issue in the dma-buf framework.
0039  */
0040 static struct drm_gem_object *udl_driver_gem_prime_import(struct drm_device *dev,
0041                               struct dma_buf *dma_buf)
0042 {
0043     struct udl_device *udl = to_udl(dev);
0044
0045     if (!udl->dmadev)
0046         return ERR_PTR(-ENODEV);
0047
0048     return drm_gem_prime_import_dev(dev, dma_buf, udl->dmadev);
0049 }
0050
0051 DEFINE_DRM_GEM_FOPS(udl_driver_fops);
0052
0053 static const struct drm_driver driver = {
0054     .driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
0055
0056     /* GEM hooks */
0057     .fops = &udl_driver_fops,
0058     DRM_GEM_SHMEM_DRIVER_OPS,
0059     .gem_prime_import = udl_driver_gem_prime_import,
0060
0061     .name = DRIVER_NAME,
0062     .desc = DRIVER_DESC,
0063     .date = DRIVER_DATE,
0064     .major = DRIVER_MAJOR,
0065     .minor = DRIVER_MINOR,
0066     .patchlevel = DRIVER_PATCHLEVEL,
0067 };
0068
0069 static struct udl_device *udl_driver_create(struct usb_interface *interface)
0070 {
0071     struct udl_device *udl;
0072     int r;
0073
0074     udl = devm_drm_dev_alloc(&interface->dev, &driver,
0075                  struct udl_device, drm);
0076     if (IS_ERR(udl))
0077         return udl;
0078
0079     r = udl_init(udl);
0080     if (r)
0081         return ERR_PTR(r);
0082
0083     usb_set_intfdata(interface, udl);
0084
0085     return udl;
0086 }
0087
0088 static int udl_usb_probe(struct usb_interface *interface,
0089              const struct usb_device_id *id)
0090 {
0091     int r;
0092     struct udl_device *udl;
0093
0094     udl = udl_driver_create(interface);
0095     if (IS_ERR(udl))
0096         return PTR_ERR(udl);
0097
0098     r = drm_dev_register(&udl->drm, 0);
0099     if (r)
0100         return r;
0101
0102     DRM_INFO("Initialized udl on minor %d\n", udl->drm.primary->index);
0103
0104     drm_fbdev_generic_setup(&udl->drm, 0);
0105
0106     return 0;
0107 }
0108
0109 static void udl_usb_disconnect(struct usb_interface *interface)
0110 {
0111     struct drm_device *dev = usb_get_intfdata(interface);
0112
0113     drm_kms_helper_poll_fini(dev);
0114     udl_drop_usb(dev);
0115     drm_dev_unplug(dev);
0116 }
0117
0118 /*
0119  * There are many DisplayLink-based graphics products, all with unique PIDs.
0120  * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
0121  * We also require a match on SubClass (0x00) and Protocol (0x00),
0122  * which is compatible with all known USB 2.0 era graphics chips and firmware,
0123  * but allows DisplayLink to increment those for any future incompatible chips
0124  */
0125 static const struct usb_device_id id_table[] = {
0126     {.idVendor = 0x17e9, .bInterfaceClass = 0xff,
0127      .bInterfaceSubClass = 0x00,
0128      .bInterfaceProtocol = 0x00,
0129      .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
0130             USB_DEVICE_ID_MATCH_INT_CLASS |
0131             USB_DEVICE_ID_MATCH_INT_SUBCLASS |
0132             USB_DEVICE_ID_MATCH_INT_PROTOCOL,},
0133     {},
0134 };
0135 MODULE_DEVICE_TABLE(usb, id_table);
0136
0137 static struct usb_driver udl_driver = {
0138     .name = "udl",
0139     .probe = udl_usb_probe,
0140     .disconnect = udl_usb_disconnect,
0141     .suspend = udl_usb_suspend,
0142     .resume = udl_usb_resume,
0143     .id_table = id_table,
0144 };
0145 module_usb_driver(udl_driver);
0146 MODULE_LICENSE("GPL");