470 lines
14 KiB
C
470 lines
14 KiB
C
/*
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* Copyright (c) 2006-2009 Red Hat Inc.
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* Copyright (c) 2006-2008 Intel Corporation
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* Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
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*
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* DRM framebuffer helper functions
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*
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* Authors:
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* Dave Airlie <airlied@linux.ie>
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* Jesse Barnes <jesse.barnes@intel.com>
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*/
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#ifndef DRM_FB_HELPER_H
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#define DRM_FB_HELPER_H
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struct drm_fb_helper;
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#include <linux/kgdb.h>
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enum mode_set_atomic {
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LEAVE_ATOMIC_MODE_SET,
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ENTER_ATOMIC_MODE_SET,
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};
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struct drm_fb_offset {
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int x, y;
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};
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struct drm_fb_helper_crtc {
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struct drm_mode_set mode_set;
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struct drm_display_mode *desired_mode;
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int x, y;
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};
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/**
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* struct drm_fb_helper_surface_size - describes fbdev size and scanout surface size
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* @fb_width: fbdev width
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* @fb_height: fbdev height
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* @surface_width: scanout buffer width
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* @surface_height: scanout buffer height
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* @surface_bpp: scanout buffer bpp
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* @surface_depth: scanout buffer depth
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*
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* Note that the scanout surface width/height may be larger than the fbdev
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* width/height. In case of multiple displays, the scanout surface is sized
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* according to the largest width/height (so it is large enough for all CRTCs
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* to scanout). But the fbdev width/height is sized to the minimum width/
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* height of all the displays. This ensures that fbcon fits on the smallest
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* of the attached displays.
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*
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* So what is passed to drm_fb_helper_fill_var() should be fb_width/fb_height,
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* rather than the surface size.
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*/
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struct drm_fb_helper_surface_size {
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u32 fb_width;
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u32 fb_height;
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u32 surface_width;
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u32 surface_height;
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u32 surface_bpp;
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u32 surface_depth;
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};
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/**
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* struct drm_fb_helper_funcs - driver callbacks for the fbdev emulation library
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*
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* Driver callbacks used by the fbdev emulation helper library.
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*/
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struct drm_fb_helper_funcs {
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/**
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* @gamma_set:
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*
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* Set the given gamma LUT register on the given CRTC.
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*
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* This callback is optional.
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*
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* FIXME:
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*
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* This callback is functionally redundant with the core gamma table
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* support and simply exists because the fbdev hasn't yet been
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* refactored to use the core gamma table interfaces.
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*/
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void (*gamma_set)(struct drm_crtc *crtc, u16 red, u16 green,
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u16 blue, int regno);
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/**
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* @gamma_get:
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*
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* Read the given gamma LUT register on the given CRTC, used to save the
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* current LUT when force-restoring the fbdev for e.g. kdbg.
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*
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* This callback is optional.
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*
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* FIXME:
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*
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* This callback is functionally redundant with the core gamma table
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* support and simply exists because the fbdev hasn't yet been
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* refactored to use the core gamma table interfaces.
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*/
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void (*gamma_get)(struct drm_crtc *crtc, u16 *red, u16 *green,
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u16 *blue, int regno);
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/**
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* @fb_probe:
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*
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* Driver callback to allocate and initialize the fbdev info structure.
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* Furthermore it also needs to allocate the DRM framebuffer used to
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* back the fbdev.
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*
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* This callback is mandatory.
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*
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* RETURNS:
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*
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* The driver should return 0 on success and a negative error code on
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* failure.
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*/
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int (*fb_probe)(struct drm_fb_helper *helper,
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struct drm_fb_helper_surface_size *sizes);
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/**
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* @initial_config:
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*
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* Driver callback to setup an initial fbdev display configuration.
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* Drivers can use this callback to tell the fbdev emulation what the
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* preferred initial configuration is. This is useful to implement
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* smooth booting where the fbdev (and subsequently all userspace) never
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* changes the mode, but always inherits the existing configuration.
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*
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* This callback is optional.
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*
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* RETURNS:
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*
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* The driver should return true if a suitable initial configuration has
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* been filled out and false when the fbdev helper should fall back to
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* the default probing logic.
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*/
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bool (*initial_config)(struct drm_fb_helper *fb_helper,
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struct drm_fb_helper_crtc **crtcs,
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struct drm_display_mode **modes,
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struct drm_fb_offset *offsets,
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bool *enabled, int width, int height);
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};
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struct drm_fb_helper_connector {
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struct drm_connector *connector;
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};
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/**
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* struct drm_fb_helper - main structure to emulate fbdev on top of KMS
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* @fb: Scanout framebuffer object
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* @dev: DRM device
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* @crtc_count: number of possible CRTCs
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* @crtc_info: per-CRTC helper state (mode, x/y offset, etc)
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* @connector_count: number of connected connectors
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* @connector_info_alloc_count: size of connector_info
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* @connector_info: array of per-connector information
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* @funcs: driver callbacks for fb helper
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* @fbdev: emulated fbdev device info struct
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* @pseudo_palette: fake palette of 16 colors
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*
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* This is the main structure used by the fbdev helpers. Drivers supporting
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* fbdev emulation should embedded this into their overall driver structure.
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* Drivers must also fill out a struct &drm_fb_helper_funcs with a few
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* operations.
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*/
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struct drm_fb_helper {
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struct drm_framebuffer *fb;
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struct drm_device *dev;
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int crtc_count;
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struct drm_fb_helper_crtc *crtc_info;
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int connector_count;
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int connector_info_alloc_count;
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struct drm_fb_helper_connector **connector_info;
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const struct drm_fb_helper_funcs *funcs;
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struct fb_info *fbdev;
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u32 pseudo_palette[17];
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/**
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* @kernel_fb_list:
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*
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* Entry on the global kernel_fb_helper_list, used for kgdb entry/exit.
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*/
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struct list_head kernel_fb_list;
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/**
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* @delayed_hotplug:
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*
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* A hotplug was received while fbdev wasn't in control of the DRM
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* device, i.e. another KMS master was active. The output configuration
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* needs to be reprobe when fbdev is in control again.
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*/
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bool delayed_hotplug;
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/**
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* @atomic:
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*
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* Use atomic updates for restore_fbdev_mode(), etc. This defaults to
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* true if driver has DRIVER_ATOMIC feature flag, but drivers can
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* override it to true after drm_fb_helper_init() if they support atomic
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* modeset but do not yet advertise DRIVER_ATOMIC (note that fb-helper
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* does not require ASYNC commits).
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*/
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bool atomic;
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};
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#ifdef CONFIG_DRM_FBDEV_EMULATION
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void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
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const struct drm_fb_helper_funcs *funcs);
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int drm_fb_helper_init(struct drm_device *dev,
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struct drm_fb_helper *helper, int crtc_count,
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int max_conn);
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void drm_fb_helper_fini(struct drm_fb_helper *helper);
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int drm_fb_helper_blank(int blank, struct fb_info *info);
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int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
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struct fb_info *info);
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int drm_fb_helper_set_par(struct fb_info *info);
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int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
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struct fb_info *info);
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int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper);
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struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper);
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void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper);
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void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper);
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void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
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uint32_t fb_width, uint32_t fb_height);
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void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
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uint32_t depth);
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void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper);
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ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
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size_t count, loff_t *ppos);
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ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
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size_t count, loff_t *ppos);
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void drm_fb_helper_sys_fillrect(struct fb_info *info,
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const struct fb_fillrect *rect);
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void drm_fb_helper_sys_copyarea(struct fb_info *info,
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const struct fb_copyarea *area);
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void drm_fb_helper_sys_imageblit(struct fb_info *info,
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const struct fb_image *image);
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void drm_fb_helper_cfb_fillrect(struct fb_info *info,
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const struct fb_fillrect *rect);
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void drm_fb_helper_cfb_copyarea(struct fb_info *info,
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const struct fb_copyarea *area);
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void drm_fb_helper_cfb_imageblit(struct fb_info *info,
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const struct fb_image *image);
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void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, int state);
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int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info);
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int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper);
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int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel);
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int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper);
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int drm_fb_helper_debug_enter(struct fb_info *info);
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int drm_fb_helper_debug_leave(struct fb_info *info);
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struct drm_display_mode *
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drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector,
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int width, int height);
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struct drm_display_mode *
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drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
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int width, int height);
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int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector);
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int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
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struct drm_connector *connector);
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#else
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static inline void drm_fb_helper_prepare(struct drm_device *dev,
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struct drm_fb_helper *helper,
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const struct drm_fb_helper_funcs *funcs)
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{
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}
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static inline int drm_fb_helper_init(struct drm_device *dev,
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struct drm_fb_helper *helper, int crtc_count,
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int max_conn)
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{
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return 0;
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}
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static inline void drm_fb_helper_fini(struct drm_fb_helper *helper)
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{
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}
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static inline int drm_fb_helper_blank(int blank, struct fb_info *info)
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{
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return 0;
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}
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static inline int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
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struct fb_info *info)
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{
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return 0;
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}
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static inline int drm_fb_helper_set_par(struct fb_info *info)
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{
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return 0;
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}
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static inline int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
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struct fb_info *info)
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{
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return 0;
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}
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static inline int
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drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
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{
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return 0;
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}
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static inline struct fb_info *
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drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
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{
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return NULL;
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}
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static inline void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
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{
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}
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static inline void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper)
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{
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}
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static inline void drm_fb_helper_fill_var(struct fb_info *info,
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struct drm_fb_helper *fb_helper,
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uint32_t fb_width, uint32_t fb_height)
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{
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}
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static inline void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
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uint32_t depth)
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{
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}
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static inline int drm_fb_helper_setcmap(struct fb_cmap *cmap,
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struct fb_info *info)
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{
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return 0;
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}
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static inline void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
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{
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}
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static inline ssize_t drm_fb_helper_sys_read(struct fb_info *info,
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char __user *buf, size_t count,
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loff_t *ppos)
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{
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return -ENODEV;
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}
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static inline ssize_t drm_fb_helper_sys_write(struct fb_info *info,
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const char __user *buf,
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size_t count, loff_t *ppos)
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{
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return -ENODEV;
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}
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static inline void drm_fb_helper_sys_fillrect(struct fb_info *info,
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const struct fb_fillrect *rect)
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{
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}
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static inline void drm_fb_helper_sys_copyarea(struct fb_info *info,
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const struct fb_copyarea *area)
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{
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}
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static inline void drm_fb_helper_sys_imageblit(struct fb_info *info,
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const struct fb_image *image)
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{
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}
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static inline void drm_fb_helper_cfb_fillrect(struct fb_info *info,
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const struct fb_fillrect *rect)
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{
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}
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static inline void drm_fb_helper_cfb_copyarea(struct fb_info *info,
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const struct fb_copyarea *area)
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{
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}
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static inline void drm_fb_helper_cfb_imageblit(struct fb_info *info,
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const struct fb_image *image)
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{
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}
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static inline void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper,
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int state)
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{
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}
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static inline int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
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{
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return 0;
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}
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static inline int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper,
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int bpp_sel)
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{
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return 0;
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}
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static inline int
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drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
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{
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return 0;
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}
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static inline int drm_fb_helper_debug_enter(struct fb_info *info)
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{
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return 0;
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}
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static inline int drm_fb_helper_debug_leave(struct fb_info *info)
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{
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return 0;
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}
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static inline struct drm_display_mode *
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drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector,
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int width, int height)
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{
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return NULL;
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}
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static inline struct drm_display_mode *
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drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
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int width, int height)
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{
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return NULL;
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}
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static inline int
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drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper,
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struct drm_connector *connector)
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{
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return 0;
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}
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static inline int
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drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
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struct drm_connector *connector)
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{
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return 0;
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}
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#endif
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#endif
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