[deliverable/linux.git] / include / drm / drm_fb_helper.h

/*
 * Copyright (c) 2006-2009 Red Hat Inc.
 * Copyright (c) 2006-2008 Intel Corporation
 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
 *
 * DRM framebuffer helper functions
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 *
 * Authors:
 *      Dave Airlie <airlied@linux.ie>
 *      Jesse Barnes <jesse.barnes@intel.com>
 */
#ifndef DRM_FB_HELPER_H
#define DRM_FB_HELPER_H

struct drm_fb_helper;

#include <drm/drm_crtc.h>
#include <linux/kgdb.h>

enum mode_set_atomic {
	LEAVE_ATOMIC_MODE_SET,
	ENTER_ATOMIC_MODE_SET,
};

struct drm_fb_offset {
	int x, y;
};

struct drm_fb_helper_crtc {
	struct drm_mode_set mode_set;
	struct drm_display_mode *desired_mode;
	int x, y;
};

/**
 * struct drm_fb_helper_surface_size - describes fbdev size and scanout surface size
 * @fb_width: fbdev width
 * @fb_height: fbdev height
 * @surface_width: scanout buffer width
 * @surface_height: scanout buffer height
 * @surface_bpp: scanout buffer bpp
 * @surface_depth: scanout buffer depth
 *
 * Note that the scanout surface width/height may be larger than the fbdev
 * width/height.  In case of multiple displays, the scanout surface is sized
 * according to the largest width/height (so it is large enough for all CRTCs
 * to scanout).  But the fbdev width/height is sized to the minimum width/
 * height of all the displays.  This ensures that fbcon fits on the smallest
 * of the attached displays.
 *
 * So what is passed to drm_fb_helper_fill_var() should be fb_width/fb_height,
 * rather than the surface size.
 */
struct drm_fb_helper_surface_size {
	u32 fb_width;
	u32 fb_height;
	u32 surface_width;
	u32 surface_height;
	u32 surface_bpp;
	u32 surface_depth;
};

/**
 * struct drm_fb_helper_funcs - driver callbacks for the fbdev emulation library
 *
 * Driver callbacks used by the fbdev emulation helper library.
 */
struct drm_fb_helper_funcs {
	/**
	 * @gamma_set:
	 *
	 * Set the given gamma LUT register on the given CRTC.
	 *
	 * This callback is optional.
	 *
	 * FIXME:
	 *
	 * This callback is functionally redundant with the core gamma table
	 * support and simply exists because the fbdev hasn't yet been
	 * refactored to use the core gamma table interfaces.
	 */
	void (*gamma_set)(struct drm_crtc *crtc, u16 red, u16 green,
			  u16 blue, int regno);
	/**
	 * @gamma_get:
	 *
	 * Read the given gamma LUT register on the given CRTC, used to save the
	 * current LUT when force-restoring the fbdev for e.g. kdbg.
	 *
	 * This callback is optional.
	 *
	 * FIXME:
	 *
	 * This callback is functionally redundant with the core gamma table
	 * support and simply exists because the fbdev hasn't yet been
	 * refactored to use the core gamma table interfaces.
	 */
	void (*gamma_get)(struct drm_crtc *crtc, u16 *red, u16 *green,
			  u16 *blue, int regno);

	/**
	 * @fb_probe:
	 *
	 * Driver callback to allocate and initialize the fbdev info structure.
	 * Furthermore it also needs to allocate the DRM framebuffer used to
	 * back the fbdev.
	 *
	 * This callback is mandatory.
	 *
	 * RETURNS:
	 *
	 * The driver should return 0 on success and a negative error code on
	 * failure.
	 */
	int (*fb_probe)(struct drm_fb_helper *helper,
			struct drm_fb_helper_surface_size *sizes);

	/**
	 * @initial_config:
	 *
	 * Driver callback to setup an initial fbdev display configuration.
	 * Drivers can use this callback to tell the fbdev emulation what the
	 * preferred initial configuration is. This is useful to implement
	 * smooth booting where the fbdev (and subsequently all userspace) never
	 * changes the mode, but always inherits the existing configuration.
	 *
	 * This callback is optional.
	 *
	 * RETURNS:
	 *
	 * The driver should return true if a suitable initial configuration has
	 * been filled out and false when the fbdev helper should fall back to
	 * the default probing logic.
	 */
	bool (*initial_config)(struct drm_fb_helper *fb_helper,
			       struct drm_fb_helper_crtc **crtcs,
			       struct drm_display_mode **modes,
			       struct drm_fb_offset *offsets,
			       bool *enabled, int width, int height);
};

struct drm_fb_helper_connector {
	struct drm_connector *connector;
};

/**
 * struct drm_fb_helper - main structure to emulate fbdev on top of KMS
 * @fb: Scanout framebuffer object
 * @dev: DRM device
 * @crtc_count: number of possible CRTCs
 * @crtc_info: per-CRTC helper state (mode, x/y offset, etc)
 * @connector_count: number of connected connectors
 * @connector_info_alloc_count: size of connector_info
 * @connector_info: array of per-connector information
 * @funcs: driver callbacks for fb helper
 * @fbdev: emulated fbdev device info struct
 * @pseudo_palette: fake palette of 16 colors
 * @dirty_clip: clip rectangle used with deferred_io to accumulate damage to
 *              the screen buffer
 * @dirty_lock: spinlock protecting @dirty_clip
 * @dirty_work: worker used to flush the framebuffer
 * @resume_work: worker used during resume if the console lock is already taken
 *
 * This is the main structure used by the fbdev helpers. Drivers supporting
 * fbdev emulation should embedded this into their overall driver structure.
 * Drivers must also fill out a struct &drm_fb_helper_funcs with a few
 * operations.
 */
struct drm_fb_helper {
	struct drm_framebuffer *fb;
	struct drm_device *dev;
	int crtc_count;
	struct drm_fb_helper_crtc *crtc_info;
	int connector_count;
	int connector_info_alloc_count;
	struct drm_fb_helper_connector **connector_info;
	const struct drm_fb_helper_funcs *funcs;
	struct fb_info *fbdev;
	u32 pseudo_palette[17];
	struct drm_clip_rect dirty_clip;
	spinlock_t dirty_lock;
	struct work_struct dirty_work;
	struct work_struct resume_work;

	/**
	 * @kernel_fb_list:
	 *
	 * Entry on the global kernel_fb_helper_list, used for kgdb entry/exit.
	 */
	struct list_head kernel_fb_list;

	/**
	 * @delayed_hotplug:
	 *
	 * A hotplug was received while fbdev wasn't in control of the DRM
	 * device, i.e. another KMS master was active. The output configuration
	 * needs to be reprobe when fbdev is in control again.
	 */
	bool delayed_hotplug;
};

#ifdef CONFIG_DRM_FBDEV_EMULATION
void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
			   const struct drm_fb_helper_funcs *funcs);
int drm_fb_helper_init(struct drm_device *dev,
		       struct drm_fb_helper *helper, int crtc_count,
		       int max_conn);
void drm_fb_helper_fini(struct drm_fb_helper *helper);
int drm_fb_helper_blank(int blank, struct fb_info *info);
int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
			      struct fb_info *info);
int drm_fb_helper_set_par(struct fb_info *info);
int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
			    struct fb_info *info);

int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper);

struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper);
void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper);
void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper);
void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
			    uint32_t fb_width, uint32_t fb_height);
void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
			    uint32_t depth);

void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper);

void drm_fb_helper_deferred_io(struct fb_info *info,
			       struct list_head *pagelist);

ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
			       size_t count, loff_t *ppos);
ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
				size_t count, loff_t *ppos);

void drm_fb_helper_sys_fillrect(struct fb_info *info,
				const struct fb_fillrect *rect);
void drm_fb_helper_sys_copyarea(struct fb_info *info,
				const struct fb_copyarea *area);
void drm_fb_helper_sys_imageblit(struct fb_info *info,
				 const struct fb_image *image);

void drm_fb_helper_cfb_fillrect(struct fb_info *info,
				const struct fb_fillrect *rect);
void drm_fb_helper_cfb_copyarea(struct fb_info *info,
				const struct fb_copyarea *area);
void drm_fb_helper_cfb_imageblit(struct fb_info *info,
				 const struct fb_image *image);

void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend);
void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper,
					bool suspend);

int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info);

int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper);
int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel);
int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper);
int drm_fb_helper_debug_enter(struct fb_info *info);
int drm_fb_helper_debug_leave(struct fb_info *info);
struct drm_display_mode *
drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector,
			int width, int height);
struct drm_display_mode *
drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
		      int width, int height);

int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector);
int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
				       struct drm_connector *connector);
#else
static inline int drm_fb_helper_modinit(void)
{
	return 0;
}

static inline void drm_fb_helper_prepare(struct drm_device *dev,
					struct drm_fb_helper *helper,
					const struct drm_fb_helper_funcs *funcs)
{
}

static inline int drm_fb_helper_init(struct drm_device *dev,
		       struct drm_fb_helper *helper, int crtc_count,
		       int max_conn)
{
	return 0;
}

static inline void drm_fb_helper_fini(struct drm_fb_helper *helper)
{
}

static inline int drm_fb_helper_blank(int blank, struct fb_info *info)
{
	return 0;
}

static inline int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
					    struct fb_info *info)
{
	return 0;
}

static inline int drm_fb_helper_set_par(struct fb_info *info)
{
	return 0;
}

static inline int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
					  struct fb_info *info)
{
	return 0;
}

static inline int
drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
{
	return 0;
}

static inline struct fb_info *
drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
{
	return NULL;
}

static inline void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
{
}
static inline void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper)
{
}

static inline void drm_fb_helper_fill_var(struct fb_info *info,
					  struct drm_fb_helper *fb_helper,
					  uint32_t fb_width, uint32_t fb_height)
{
}

static inline void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
					  uint32_t depth)
{
}

static inline int drm_fb_helper_setcmap(struct fb_cmap *cmap,
					struct fb_info *info)
{
	return 0;
}

static inline void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
{
}

static inline void drm_fb_helper_deferred_io(struct fb_info *info,
					     struct list_head *pagelist)
{
}

static inline ssize_t drm_fb_helper_sys_read(struct fb_info *info,
					     char __user *buf, size_t count,
					     loff_t *ppos)
{
	return -ENODEV;
}

static inline ssize_t drm_fb_helper_sys_write(struct fb_info *info,
					      const char __user *buf,
					      size_t count, loff_t *ppos)
{
	return -ENODEV;
}

static inline void drm_fb_helper_sys_fillrect(struct fb_info *info,
					      const struct fb_fillrect *rect)
{
}

static inline void drm_fb_helper_sys_copyarea(struct fb_info *info,
					      const struct fb_copyarea *area)
{
}

static inline void drm_fb_helper_sys_imageblit(struct fb_info *info,
					       const struct fb_image *image)
{
}

static inline void drm_fb_helper_cfb_fillrect(struct fb_info *info,
					      const struct fb_fillrect *rect)
{
}

static inline void drm_fb_helper_cfb_copyarea(struct fb_info *info,
					      const struct fb_copyarea *area)
{
}

static inline void drm_fb_helper_cfb_imageblit(struct fb_info *info,
					       const struct fb_image *image)
{
}

static inline void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper,
					     bool suspend)
{
}

static inline void
drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper, bool suspend)
{
}

static inline int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
{
	return 0;
}

static inline int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper,
					       int bpp_sel)
{
	return 0;
}

static inline int
drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
{
	return 0;
}

static inline int drm_fb_helper_debug_enter(struct fb_info *info)
{
	return 0;
}

static inline int drm_fb_helper_debug_leave(struct fb_info *info)
{
	return 0;
}

static inline struct drm_display_mode *
drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector,
		       int width, int height)
{
	return NULL;
}

static inline struct drm_display_mode *
drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
		      int width, int height)
{
	return NULL;
}

static inline int
drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper,
				struct drm_connector *connector)
{
	return 0;
}

static inline int
drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
				   struct drm_connector *connector)
{
	return 0;
}

#endif

static inline int
drm_fb_helper_remove_conflicting_framebuffers(struct apertures_struct *a,
					      const char *name, bool primary)
{
#if IS_REACHABLE(CONFIG_FB)
	return remove_conflicting_framebuffers(a, name, primary);
#else
	return 0;
#endif
}

#endif
Commit	Line	Data
785b93ef DA	1	/*
	2	* Copyright (c) 2006-2009 Red Hat Inc.
	3	* Copyright (c) 2006-2008 Intel Corporation
	4	* Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
	5	*
	6	* DRM framebuffer helper functions
	7	*
	8	* Permission to use, copy, modify, distribute, and sell this software and its
	9	* documentation for any purpose is hereby granted without fee, provided that
	10	* the above copyright notice appear in all copies and that both that copyright
	11	* notice and this permission notice appear in supporting documentation, and
	12	* that the name of the copyright holders not be used in advertising or
	13	* publicity pertaining to distribution of the software without specific,
	14	* written prior permission. The copyright holders make no representations
	15	* about the suitability of this software for any purpose. It is provided "as
	16	* is" without express or implied warranty.
	17	*
	18	* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
	19	* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
	20	* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
	21	* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
	22	* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
	23	* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
	24	* OF THIS SOFTWARE.
	25	*
	26	* Authors:
	27	* Dave Airlie <airlied@linux.ie>
	28	* Jesse Barnes <jesse.barnes@intel.com>
	29	*/
	30	#ifndef DRM_FB_HELPER_H
	31	#define DRM_FB_HELPER_H
	32
4abe3520 DA	33	struct drm_fb_helper;
4abe3520 DA	34
44adece5	35	#include <drm/drm_crtc.h>
1a7aba7f JB	36	#include <linux/kgdb.h>
1a7aba7f JB	37
b516a9ef DV	38	enum mode_set_atomic {
	39	LEAVE_ATOMIC_MODE_SET,
	40	ENTER_ATOMIC_MODE_SET,
	41	};
	42
b0ee9e7f DA	43	struct drm_fb_offset {
	44	int x, y;
	45	};
	46
785b93ef	47	struct drm_fb_helper_crtc {
785b93ef	48	struct drm_mode_set mode_set;
8be48d92	49	struct drm_display_mode *desired_mode;
b0ee9e7f	50	int x, y;
785b93ef DA	51	};
785b93ef DA	52
b7b5ee59 RC	53	/**
	54	* struct drm_fb_helper_surface_size - describes fbdev size and scanout surface size
	55	* @fb_width: fbdev width
	56	* @fb_height: fbdev height
	57	* @surface_width: scanout buffer width
	58	* @surface_height: scanout buffer height
	59	* @surface_bpp: scanout buffer bpp
	60	* @surface_depth: scanout buffer depth
	61	*
	62	* Note that the scanout surface width/height may be larger than the fbdev
	63	* width/height. In case of multiple displays, the scanout surface is sized
	64	* according to the largest width/height (so it is large enough for all CRTCs
	65	* to scanout). But the fbdev width/height is sized to the minimum width/
	66	* height of all the displays. This ensures that fbcon fits on the smallest
	67	* of the attached displays.
	68	*
	69	* So what is passed to drm_fb_helper_fill_var() should be fb_width/fb_height,
	70	* rather than the surface size.
	71	*/
38651674 DA	72	struct drm_fb_helper_surface_size {
	73	u32 fb_width;
	74	u32 fb_height;
	75	u32 surface_width;
	76	u32 surface_height;
	77	u32 surface_bpp;
	78	u32 surface_depth;
	79	};
	80
207fd329 DV	81	/**
207fd329 DV	82	* struct drm_fb_helper_funcs - driver callbacks for the fbdev emulation library
207fd329 DV	83	*
	84	* Driver callbacks used by the fbdev emulation helper library.
	85	*/
4abe3520	86	struct drm_fb_helper_funcs {
264d6970 DV	87	/**
	88	* @gamma_set:
	89	*
	90	* Set the given gamma LUT register on the given CRTC.
	91	*
	92	* This callback is optional.
	93	*
	94	* FIXME:
	95	*
	96	* This callback is functionally redundant with the core gamma table
	97	* support and simply exists because the fbdev hasn't yet been
	98	* refactored to use the core gamma table interfaces.
	99	*/
4abe3520 DA	100	void (gamma_set)(struct drm_crtc crtc, u16 red, u16 green,
4abe3520 DA	101	u16 blue, int regno);
264d6970 DV	102	/**
	103	* @gamma_get:
	104	*
	105	* Read the given gamma LUT register on the given CRTC, used to save the
	106	* current LUT when force-restoring the fbdev for e.g. kdbg.
	107	*
	108	* This callback is optional.
	109	*
	110	* FIXME:
	111	*
	112	* This callback is functionally redundant with the core gamma table
	113	* support and simply exists because the fbdev hasn't yet been
	114	* refactored to use the core gamma table interfaces.
	115	*/
4abe3520 DA	116	void (gamma_get)(struct drm_crtc crtc, u16 red, u16 green,
	117	u16 *blue, int regno);
	118
264d6970 DV	119	/**
	120	* @fb_probe:
	121	*
	122	* Driver callback to allocate and initialize the fbdev info structure.
	123	* Furthermore it also needs to allocate the DRM framebuffer used to
	124	* back the fbdev.
	125	*
	126	* This callback is mandatory.
	127	*
	128	* RETURNS:
	129	*
	130	* The driver should return 0 on success and a negative error code on
	131	* failure.
	132	*/
4abe3520 DA	133	int (fb_probe)(struct drm_fb_helper helper,
4abe3520 DA	134	struct drm_fb_helper_surface_size *sizes);
264d6970 DV	135
	136	/**
	137	* @initial_config:
	138	*
	139	* Driver callback to setup an initial fbdev display configuration.
	140	* Drivers can use this callback to tell the fbdev emulation what the
	141	* preferred initial configuration is. This is useful to implement
	142	* smooth booting where the fbdev (and subsequently all userspace) never
	143	* changes the mode, but always inherits the existing configuration.
	144	*
	145	* This callback is optional.
	146	*
	147	* RETURNS:
	148	*
	149	* The driver should return true if a suitable initial configuration has
	150	* been filled out and false when the fbdev helper should fall back to
	151	* the default probing logic.
	152	*/
11e17a08 JB	153	bool (initial_config)(struct drm_fb_helper fb_helper,
	154	struct drm_fb_helper_crtc **crtcs,
	155	struct drm_display_mode **modes,
b0ee9e7f	156	struct drm_fb_offset *offsets,
11e17a08	157	bool *enabled, int width, int height);
4abe3520 DA	158	};
4abe3520 DA	159
d50ba256	160	struct drm_fb_helper_connector {
0b4c0f3f	161	struct drm_connector *connector;
d50ba256 DA	162	};
d50ba256 DA	163
9685cd9d	164	/**
264d6970 DV	165	* struct drm_fb_helper - main structure to emulate fbdev on top of KMS
	166	* @fb: Scanout framebuffer object
	167	* @dev: DRM device
9685cd9d RC	168	* @crtc_count: number of possible CRTCs
	169	* @crtc_info: per-CRTC helper state (mode, x/y offset, etc)
	170	* @connector_count: number of connected connectors
	171	* @connector_info_alloc_count: size of connector_info
264d6970	172	* @connector_info: array of per-connector information
9685cd9d RC	173	* @funcs: driver callbacks for fb helper
	174	* @fbdev: emulated fbdev device info struct
	175	* @pseudo_palette: fake palette of 16 colors
eaa434de NT	176	* @dirty_clip: clip rectangle used with deferred_io to accumulate damage to
	177	* the screen buffer
	178	* @dirty_lock: spinlock protecting @dirty_clip
	179	* @dirty_work: worker used to flush the framebuffer
cfe63423	180	* @resume_work: worker used during resume if the console lock is already taken
264d6970 DV	181	*
	182	* This is the main structure used by the fbdev helpers. Drivers supporting
	183	* fbdev emulation should embedded this into their overall driver structure.
	184	* Drivers must also fill out a struct &drm_fb_helper_funcs with a few
	185	* operations.
9685cd9d	186	*/
785b93ef DA	187	struct drm_fb_helper {
	188	struct drm_framebuffer *fb;
	189	struct drm_device *dev;
785b93ef DA	190	int crtc_count;
785b93ef DA	191	struct drm_fb_helper_crtc *crtc_info;
0b4c0f3f	192	int connector_count;
65c2a89c	193	int connector_info_alloc_count;
0b4c0f3f	194	struct drm_fb_helper_connector **connector_info;
3a493879	195	const struct drm_fb_helper_funcs *funcs;
38651674 DA	196	struct fb_info *fbdev;
38651674 DA	197	u32 pseudo_palette[17];
eaa434de NT	198	struct drm_clip_rect dirty_clip;
	199	spinlock_t dirty_lock;
	200	struct work_struct dirty_work;
cfe63423	201	struct work_struct resume_work;
264d6970 DV	202
	203	/**
	204	* @kernel_fb_list:
	205	*
	206	* Entry on the global kernel_fb_helper_list, used for kgdb entry/exit.
	207	*/
785b93ef	208	struct list_head kernel_fb_list;
8be48d92	209
264d6970 DV	210	/**
	211	* @delayed_hotplug:
	212	*
	213	* A hotplug was received while fbdev wasn't in control of the DRM
	214	* device, i.e. another KMS master was active. The output configuration
	215	* needs to be reprobe when fbdev is in control again.
	216	*/
4abe3520	217	bool delayed_hotplug;
785b93ef DA	218	};
785b93ef DA	219
a03fdcb1	220	#ifdef CONFIG_DRM_FBDEV_EMULATION
10a23102 TR	221	void drm_fb_helper_prepare(struct drm_device dev, struct drm_fb_helper helper,
10a23102 TR	222	const struct drm_fb_helper_funcs *funcs);
4abe3520 DA	223	int drm_fb_helper_init(struct drm_device *dev,
4abe3520 DA	224	struct drm_fb_helper *helper, int crtc_count,
eb1f8e4f	225	int max_conn);
4abe3520	226	void drm_fb_helper_fini(struct drm_fb_helper *helper);
785b93ef DA	227	int drm_fb_helper_blank(int blank, struct fb_info *info);
	228	int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
	229	struct fb_info *info);
	230	int drm_fb_helper_set_par(struct fb_info *info);
	231	int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
	232	struct fb_info *info);
785b93ef	233
b7bdf0a8	234	int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper);
b8017d6c AT	235
	236	struct fb_info drm_fb_helper_alloc_fbi(struct drm_fb_helper fb_helper);
	237	void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper);
	238	void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper);
38651674	239	void drm_fb_helper_fill_var(struct fb_info info, struct drm_fb_helper fb_helper,
785b93ef	240	uint32_t fb_width, uint32_t fb_height);
3632ef89 DA	241	void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
	242	uint32_t depth);
	243
47074ab7 AT	244	void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper);
47074ab7 AT	245
eaa434de NT	246	void drm_fb_helper_deferred_io(struct fb_info *info,
	247	struct list_head *pagelist);
	248
cbb1a82e AT	249	ssize_t drm_fb_helper_sys_read(struct fb_info info, char __user buf,
	250	size_t count, loff_t *ppos);
	251	ssize_t drm_fb_helper_sys_write(struct fb_info info, const char __user buf,
	252	size_t count, loff_t *ppos);
	253
742547b7 AT	254	void drm_fb_helper_sys_fillrect(struct fb_info *info,
	255	const struct fb_fillrect *rect);
	256	void drm_fb_helper_sys_copyarea(struct fb_info *info,
	257	const struct fb_copyarea *area);
	258	void drm_fb_helper_sys_imageblit(struct fb_info *info,
	259	const struct fb_image *image);
	260
	261	void drm_fb_helper_cfb_fillrect(struct fb_info *info,
	262	const struct fb_fillrect *rect);
	263	void drm_fb_helper_cfb_copyarea(struct fb_info *info,
	264	const struct fb_copyarea *area);
	265	void drm_fb_helper_cfb_imageblit(struct fb_info *info,
	266	const struct fb_image *image);
	267
28579f37	268	void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend);
cfe63423	269	void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper,
28579f37	270	bool suspend);
fdefa58a	271
068143d3	272	int drm_fb_helper_setcmap(struct fb_cmap cmap, struct fb_info info);
d50ba256	273
7394371d	274	int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper);
01934c2a	275	int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel);
0b4c0f3f	276	int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper);
1a7aba7f JB	277	int drm_fb_helper_debug_enter(struct fb_info *info);
1a7aba7f JB	278	int drm_fb_helper_debug_leave(struct fb_info *info);
2f1046f3 JB	279	struct drm_display_mode *
	280	drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector,
	281	int width, int height);
	282	struct drm_display_mode *
	283	drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
	284	int width, int height);
8be48d92	285
65c2a89c DA	286	int drm_fb_helper_add_one_connector(struct drm_fb_helper fb_helper, struct drm_connector connector);
	287	int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
	288	struct drm_connector *connector);
a03fdcb1	289	#else
70412cfa RA	290	static inline int drm_fb_helper_modinit(void)
	291	{
	292	return 0;
	293	}
	294
a03fdcb1 AT	295	static inline void drm_fb_helper_prepare(struct drm_device *dev,
	296	struct drm_fb_helper *helper,
	297	const struct drm_fb_helper_funcs *funcs)
	298	{
	299	}
	300
	301	static inline int drm_fb_helper_init(struct drm_device *dev,
	302	struct drm_fb_helper *helper, int crtc_count,
	303	int max_conn)
	304	{
	305	return 0;
	306	}
	307
	308	static inline void drm_fb_helper_fini(struct drm_fb_helper *helper)
	309	{
	310	}
	311
	312	static inline int drm_fb_helper_blank(int blank, struct fb_info *info)
	313	{
	314	return 0;
	315	}
	316
	317	static inline int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
	318	struct fb_info *info)
	319	{
	320	return 0;
	321	}
	322
	323	static inline int drm_fb_helper_set_par(struct fb_info *info)
	324	{
	325	return 0;
	326	}
	327
	328	static inline int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
	329	struct fb_info *info)
	330	{
	331	return 0;
	332	}
	333
b7bdf0a8	334	static inline int
a03fdcb1 AT	335	drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
a03fdcb1 AT	336	{
b7bdf0a8	337	return 0;
a03fdcb1 AT	338	}
	339
	340	static inline struct fb_info *
	341	drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
	342	{
	343	return NULL;
	344	}
	345
	346	static inline void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
	347	{
	348	}
	349	static inline void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper)
	350	{
	351	}
	352
	353	static inline void drm_fb_helper_fill_var(struct fb_info *info,
	354	struct drm_fb_helper *fb_helper,
	355	uint32_t fb_width, uint32_t fb_height)
	356	{
	357	}
	358
	359	static inline void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
	360	uint32_t depth)
	361	{
	362	}
	363
	364	static inline int drm_fb_helper_setcmap(struct fb_cmap *cmap,
	365	struct fb_info *info)
	366	{
	367	return 0;
	368	}
	369
	370	static inline void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
	371	{
	372	}
	373
eaa434de NT	374	static inline void drm_fb_helper_deferred_io(struct fb_info *info,
	375	struct list_head *pagelist)
	376	{
	377	}
	378
a03fdcb1 AT	379	static inline ssize_t drm_fb_helper_sys_read(struct fb_info *info,
	380	char __user *buf, size_t count,
	381	loff_t *ppos)
	382	{
	383	return -ENODEV;
	384	}
	385
	386	static inline ssize_t drm_fb_helper_sys_write(struct fb_info *info,
	387	const char __user *buf,
	388	size_t count, loff_t *ppos)
	389	{
	390	return -ENODEV;
	391	}
	392
	393	static inline void drm_fb_helper_sys_fillrect(struct fb_info *info,
	394	const struct fb_fillrect *rect)
	395	{
	396	}
	397
	398	static inline void drm_fb_helper_sys_copyarea(struct fb_info *info,
	399	const struct fb_copyarea *area)
	400	{
	401	}
	402
	403	static inline void drm_fb_helper_sys_imageblit(struct fb_info *info,
	404	const struct fb_image *image)
	405	{
	406	}
	407
	408	static inline void drm_fb_helper_cfb_fillrect(struct fb_info *info,
	409	const struct fb_fillrect *rect)
	410	{
	411	}
	412
	413	static inline void drm_fb_helper_cfb_copyarea(struct fb_info *info,
	414	const struct fb_copyarea *area)
	415	{
	416	}
	417
	418	static inline void drm_fb_helper_cfb_imageblit(struct fb_info *info,
	419	const struct fb_image *image)
	420	{
	421	}
	422
	423	static inline void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper,
28579f37	424	bool suspend)
a03fdcb1 AT	425	{
	426	}
	427
cfe63423	428	static inline void
28579f37	429	drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper, bool suspend)
cfe63423 NT	430	{
	431	}
	432
a03fdcb1 AT	433	static inline int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
	434	{
	435	return 0;
	436	}
	437
	438	static inline int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper,
	439	int bpp_sel)
	440	{
	441	return 0;
	442	}
	443
	444	static inline int
	445	drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
	446	{
	447	return 0;
	448	}
	449
	450	static inline int drm_fb_helper_debug_enter(struct fb_info *info)
	451	{
	452	return 0;
	453	}
	454
	455	static inline int drm_fb_helper_debug_leave(struct fb_info *info)
	456	{
	457	return 0;
	458	}
	459
	460	static inline struct drm_display_mode *
	461	drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector,
	462	int width, int height)
	463	{
	464	return NULL;
	465	}
	466
	467	static inline struct drm_display_mode *
	468	drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
	469	int width, int height)
	470	{
	471	return NULL;
	472	}
	473
	474	static inline int
	475	drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper,
	476	struct drm_connector *connector)
	477	{
	478	return 0;
	479	}
	480
	481	static inline int
	482	drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
	483	struct drm_connector *connector)
	484	{
	485	return 0;
	486	}
44adece5	487
0a3bfe29 CW	488	#endif
0a3bfe29 CW	489
44adece5 DV	490	static inline int
	491	drm_fb_helper_remove_conflicting_framebuffers(struct apertures_struct *a,
	492	const char *name, bool primary)
	493	{
749cc6f7	494	#if IS_REACHABLE(CONFIG_FB)
0a3bfe29 CW	495	return remove_conflicting_framebuffers(a, name, primary);
0a3bfe29 CW	496	#else
44adece5	497	return 0;
a03fdcb1	498	#endif
0a3bfe29 CW	499	}
0a3bfe29 CW	500
785b93ef	501	#endif