The fbdevdrm driver runs DRM on top of fbdev framebuffer drivers. It allows for using legacy drivers with modern userspace and gives a template for converting fbdev drivers to DRM.
Signed-off-by: Thomas Zimmermann tzimmermann@suse.de --- drivers/gpu/drm/Kconfig | 2 + drivers/gpu/drm/Makefile | 1 + drivers/gpu/drm/fbdevdrm/Kconfig | 13 +++++ drivers/gpu/drm/fbdevdrm/Makefile | 4 ++ drivers/gpu/drm/fbdevdrm/fbdevdrm_drv.c | 72 +++++++++++++++++++++++++ 5 files changed, 92 insertions(+) create mode 100644 drivers/gpu/drm/fbdevdrm/Kconfig create mode 100644 drivers/gpu/drm/fbdevdrm/Makefile create mode 100644 drivers/gpu/drm/fbdevdrm/fbdevdrm_drv.c
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index 5e1bc630b885..c7fb1d382b2c 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -337,6 +337,8 @@ source "drivers/gpu/drm/xen/Kconfig"
source "drivers/gpu/drm/vboxvideo/Kconfig"
+source "drivers/gpu/drm/fbdevdrm/Kconfig" + # Keep legacy drivers last
menuconfig DRM_LEGACY diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index e630eccb951c..ecfa0c0b7330 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -111,3 +111,4 @@ obj-$(CONFIG_DRM_PL111) += pl111/ obj-$(CONFIG_DRM_TVE200) += tve200/ obj-$(CONFIG_DRM_XEN) += xen/ obj-$(CONFIG_DRM_VBOXVIDEO) += vboxvideo/ +obj-$(CONFIG_DRM_FBDEVDRM) += fbdevdrm/ diff --git a/drivers/gpu/drm/fbdevdrm/Kconfig b/drivers/gpu/drm/fbdevdrm/Kconfig new file mode 100644 index 000000000000..ce071d0f4116 --- /dev/null +++ b/drivers/gpu/drm/fbdevdrm/Kconfig @@ -0,0 +1,13 @@ +config DRM_FBDEVDRM + tristate "DRM over FBDEV" + depends on DRM && PCI && AGP + select FB_NOTIFY + select FB_SYS_FILLRECT + select FB_SYS_COPYAREA + select FB_SYS_IMAGEBLIT + select DRM_KMS_HELPER + select DRM_KMS_FB_HELPER + select DRM_TTM + help + Choose this option to use fbdev video drivers within DRM. + If M is selected the module will be called fbdevdrm. diff --git a/drivers/gpu/drm/fbdevdrm/Makefile b/drivers/gpu/drm/fbdevdrm/Makefile new file mode 100644 index 000000000000..65e6b43cf682 --- /dev/null +++ b/drivers/gpu/drm/fbdevdrm/Makefile @@ -0,0 +1,4 @@ +ccflags-y = -Iinclude/drm +fbdevdrm-y := fbdevdrm_drv.o + +obj-$(CONFIG_DRM_FBDEVDRM) += fbdevdrm.o diff --git a/drivers/gpu/drm/fbdevdrm/fbdevdrm_drv.c b/drivers/gpu/drm/fbdevdrm/fbdevdrm_drv.c new file mode 100644 index 000000000000..dcb263b0c386 --- /dev/null +++ b/drivers/gpu/drm/fbdevdrm/fbdevdrm_drv.c @@ -0,0 +1,72 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later + * + * One purpose of this driver is to allow for easy conversion of framebuffer + * drivers to DRM. As a special exception to the GNU GPL, you are allowed to + * relicense this file under the terms of a license of your choice if you're + * porting a framebuffer driver. In order to do so, update the SPDX license + * identifier to the new license and remove this exception. + * + * If you add code to this file, please ensure that it's compatible with the + * stated exception. + */ + +#include <linux/fb.h> +#include <linux/module.h> + +/* DRM porting note: Here are some general information about the driver, + * licensing and maintenance contact. If you're porting an fbdev driver + * to DRM, update them with the appropriate values. For the license, you + * should either pick the license of the ported fbdev driver or + * GPL-2.0-or-later. Don't forget to remove the license exception statement + * from the file headers. + */ +#define DRIVER_AUTHOR "Thomas Zimmermann tzimmermann@suse.de" +#define DRIVER_NAME "fbdevdrm" +#define DRIVER_DESCRIPTION "DRM over FBDEV" +#define DRIVER_LICENSE "GPL and additional rights" +#define DRIVER_DATE "20190301" +#define DRIVER_MAJOR 0 +#define DRIVER_MINOR 0 +#define DRIVER_PATCHLEVEL 1 + +/* Module entry points */ + +static int fb_client_notifier_call(struct notifier_block *nb, + unsigned long action, void *data) +{ + static int (* const on_event[])(struct fb_info*, void*) = { + }; + + const struct fb_event *event = data; + + if ((action >= ARRAY_SIZE(on_event)) || !on_event[action]) + return 0; /* event not handled by us */ + return on_event[action](event->info, event->data); +} + +static struct notifier_block fb_client = { + .notifier_call = fb_client_notifier_call +}; + +static int __init fbdevdrm_init(void) +{ + int ret; + + ret = fb_register_client(&fb_client); + if (ret < 0) + return ret; + + return 0; +} + +static void __exit fbdevdrm_exit(void) +{ + fb_unregister_client(&fb_client); +} + +module_init(fbdevdrm_init); +module_exit(fbdevdrm_exit); + +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESCRIPTION); +MODULE_LICENSE(DRIVER_LICENSE);