diff options
Diffstat (limited to 'drivers/gpu/drm/udl/udl_drv.c')
| -rw-r--r-- | drivers/gpu/drm/udl/udl_drv.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/drivers/gpu/drm/udl/udl_drv.c b/drivers/gpu/drm/udl/udl_drv.c new file mode 100644 index 000000000..bcf32d188 --- /dev/null +++ b/drivers/gpu/drm/udl/udl_drv.c @@ -0,0 +1,151 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2012 Red Hat + */ + +#include <linux/module.h> + +#include <drm/drm_crtc_helper.h> +#include <drm/drm_drv.h> +#include <drm/drm_fb_helper.h> +#include <drm/drm_file.h> +#include <drm/drm_gem_shmem_helper.h> +#include <drm/drm_managed.h> +#include <drm/drm_ioctl.h> +#include <drm/drm_probe_helper.h> +#include <drm/drm_print.h> + +#include "udl_drv.h" + +static int udl_usb_suspend(struct usb_interface *interface, + pm_message_t message) +{ + struct drm_device *dev = usb_get_intfdata(interface); + + return drm_mode_config_helper_suspend(dev); +} + +static int udl_usb_resume(struct usb_interface *interface) +{ + struct drm_device *dev = usb_get_intfdata(interface); + + return drm_mode_config_helper_resume(dev); +} + +/* + * FIXME: Dma-buf sharing requires DMA support by the importing device. + * This function is a workaround to make USB devices work as well. + * See todo.rst for how to fix the issue in the dma-buf framework. + */ +static struct drm_gem_object *udl_driver_gem_prime_import(struct drm_device *dev, + struct dma_buf *dma_buf) +{ + struct udl_device *udl = to_udl(dev); + + if (!udl->dmadev) + return ERR_PTR(-ENODEV); + + return drm_gem_prime_import_dev(dev, dma_buf, udl->dmadev); +} + +DEFINE_DRM_GEM_FOPS(udl_driver_fops); + +static struct drm_driver driver = { + .driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET, + + /* GEM hooks */ + .gem_create_object = drm_gem_shmem_create_object_cached, + + .fops = &udl_driver_fops, + DRM_GEM_SHMEM_DRIVER_OPS, + .gem_prime_import = udl_driver_gem_prime_import, + + .name = DRIVER_NAME, + .desc = DRIVER_DESC, + .date = DRIVER_DATE, + .major = DRIVER_MAJOR, + .minor = DRIVER_MINOR, + .patchlevel = DRIVER_PATCHLEVEL, +}; + +static struct udl_device *udl_driver_create(struct usb_interface *interface) +{ + struct usb_device *udev = interface_to_usbdev(interface); + struct udl_device *udl; + int r; + + udl = devm_drm_dev_alloc(&interface->dev, &driver, + struct udl_device, drm); + if (IS_ERR(udl)) + return udl; + + udl->udev = udev; + + r = udl_init(udl); + if (r) + return ERR_PTR(r); + + usb_set_intfdata(interface, udl); + + return udl; +} + +static int udl_usb_probe(struct usb_interface *interface, + const struct usb_device_id *id) +{ + int r; + struct udl_device *udl; + + udl = udl_driver_create(interface); + if (IS_ERR(udl)) + return PTR_ERR(udl); + + r = drm_dev_register(&udl->drm, 0); + if (r) + return r; + + DRM_INFO("Initialized udl on minor %d\n", udl->drm.primary->index); + + drm_fbdev_generic_setup(&udl->drm, 0); + + return 0; +} + +static void udl_usb_disconnect(struct usb_interface *interface) +{ + struct drm_device *dev = usb_get_intfdata(interface); + + drm_kms_helper_poll_fini(dev); + udl_drop_usb(dev); + drm_dev_unplug(dev); +} + +/* + * There are many DisplayLink-based graphics products, all with unique PIDs. + * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff) + * We also require a match on SubClass (0x00) and Protocol (0x00), + * which is compatible with all known USB 2.0 era graphics chips and firmware, + * but allows DisplayLink to increment those for any future incompatible chips + */ +static const struct usb_device_id id_table[] = { + {.idVendor = 0x17e9, .bInterfaceClass = 0xff, + .bInterfaceSubClass = 0x00, + .bInterfaceProtocol = 0x00, + .match_flags = USB_DEVICE_ID_MATCH_VENDOR | + USB_DEVICE_ID_MATCH_INT_CLASS | + USB_DEVICE_ID_MATCH_INT_SUBCLASS | + USB_DEVICE_ID_MATCH_INT_PROTOCOL,}, + {}, +}; +MODULE_DEVICE_TABLE(usb, id_table); + +static struct usb_driver udl_driver = { + .name = "udl", + .probe = udl_usb_probe, + .disconnect = udl_usb_disconnect, + .suspend = udl_usb_suspend, + .resume = udl_usb_resume, + .id_table = id_table, +}; +module_usb_driver(udl_driver); +MODULE_LICENSE("GPL"); |