blob: 3e7e75383d327d2dbd2e81410033cd26c193e003 [file] [log] [blame]
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_FB_H
#define _LINUX_FB_H
#include <linux/kgdb.h>
#include <uapi/linux/fb.h>
#define FBIO_CURSOR _IOWR('F', 0x08, struct fb_cursor_user)
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/workqueue.h>
#include <linux/notifier.h>
#include <linux/list.h>
#include <linux/backlight.h>
#include <linux/slab.h>
#include <asm/io.h>
struct vm_area_struct;
struct fb_info;
struct device;
struct file;
struct videomode;
struct device_node;
/* Definitions below are used in the parsed monitor specs */
#define FB_DISP_DDI 1
#define FB_DISP_ANA_700_300 2
#define FB_DISP_ANA_714_286 4
#define FB_DISP_ANA_1000_400 8
#define FB_DISP_ANA_700_000 16
#define FB_DISP_MONO 32
#define FB_DISP_RGB 64
#define FB_DISP_MULTI 128
#define FB_DISP_UNKNOWN 256
#define FB_SIGNAL_NONE 0
#define FB_MISC_1ST_DETAIL 2 /* First Detailed Timing is preferred */
#define FB_MISC_HDMI 4
struct fb_chroma {
__u32 redx; /* in fraction of 1024 */
__u32 greenx;
__u32 bluex;
__u32 whitex;
__u32 redy;
__u32 greeny;
__u32 bluey;
__u32 whitey;
struct fb_monspecs {
struct fb_chroma chroma;
struct fb_videomode *modedb; /* mode database */
__u8 manufacturer[4]; /* Manufacturer */
__u8 monitor[14]; /* Monitor String */
__u8 serial_no[14]; /* Serial Number */
__u8 ascii[14]; /* ? */
__u32 modedb_len; /* mode database length */
__u32 model; /* Monitor Model */
__u32 serial; /* Serial Number - Integer */
__u32 year; /* Year manufactured */
__u32 week; /* Week Manufactured */
__u32 hfmin; /* hfreq lower limit (Hz) */
__u32 hfmax; /* hfreq upper limit (Hz) */
__u32 dclkmin; /* pixelclock lower limit (Hz) */
__u32 dclkmax; /* pixelclock upper limit (Hz) */
__u16 input; /* display type - see FB_DISP_* */
__u16 dpms; /* DPMS support - see FB_DPMS_ */
__u16 signal; /* Signal Type - see FB_SIGNAL_* */
__u16 vfmin; /* vfreq lower limit (Hz) */
__u16 vfmax; /* vfreq upper limit (Hz) */
__u16 gamma; /* Gamma - in fractions of 100 */
__u16 gtf : 1; /* supports GTF */
__u16 misc; /* Misc flags - see FB_MISC_* */
__u8 version; /* EDID version... */
__u8 revision; /* ...and revision */
__u8 max_x; /* Maximum horizontal size (cm) */
__u8 max_y; /* Maximum vertical size (cm) */
struct fb_cmap_user {
__u32 start; /* First entry */
__u32 len; /* Number of entries */
__u16 __user *red; /* Red values */
__u16 __user *green;
__u16 __user *blue;
__u16 __user *transp; /* transparency, can be NULL */
struct fb_image_user {
__u32 dx; /* Where to place image */
__u32 dy;
__u32 width; /* Size of image */
__u32 height;
__u32 fg_color; /* Only used when a mono bitmap */
__u32 bg_color;
__u8 depth; /* Depth of the image */
const char __user *data; /* Pointer to image data */
struct fb_cmap_user cmap; /* color map info */
struct fb_cursor_user {
__u16 set; /* what to set */
__u16 enable; /* cursor on/off */
__u16 rop; /* bitop operation */
const char __user *mask; /* cursor mask bits */
struct fbcurpos hot; /* cursor hot spot */
struct fb_image_user image; /* Cursor image */
* Register/unregister for framebuffer events
/* The resolution of the passed in fb_info about to change */
/* The display on this fb_info is being suspended, no access to the
* framebuffer is allowed any more after that call returns
#define FB_EVENT_SUSPEND 0x02
/* The display on this fb_info was resumed, you can restore the display
* if you own it
#define FB_EVENT_RESUME 0x03
/* An entry from the modelist was removed */
/* A driver registered itself */
/* A driver unregistered itself */
/* CONSOLE-SPECIFIC: get console to framebuffer mapping */
/* CONSOLE-SPECIFIC: set console to framebuffer mapping */
/* A hardware display blank change occurred */
#define FB_EVENT_BLANK 0x09
/* Private modelist is to be replaced */
/* The resolution of the passed in fb_info about to change and
all vc's should be changed */
/* A software display blank change occurred */
/* Get drawing requirements */
#define FB_EVENT_GET_REQ 0x0D
/* Unbind from the console if possible */
/* CONSOLE-SPECIFIC: remap all consoles to new fb - for vga_switcheroo */
/* A hardware display blank early change occurred */
/* A hardware display blank revert early change occurred */
struct fb_event {
struct fb_info *info;
void *data;
struct fb_blit_caps {
u32 x;
u32 y;
u32 len;
u32 flags;
extern int fb_register_client(struct notifier_block *nb);
extern int fb_unregister_client(struct notifier_block *nb);
extern int fb_notifier_call_chain(unsigned long val, void *v);
static inline int fb_register_client(struct notifier_block *nb)
return 0;
static inline int fb_unregister_client(struct notifier_block *nb)
return 0;
static inline int fb_notifier_call_chain(unsigned long val, void *v)
return 0;
* Pixmap structure definition
* The purpose of this structure is to translate data
* from the hardware independent format of fbdev to what
* format the hardware needs.
#define FB_PIXMAP_DEFAULT 1 /* used internally by fbcon */
#define FB_PIXMAP_SYSTEM 2 /* memory is in system RAM */
#define FB_PIXMAP_IO 4 /* memory is iomapped */
#define FB_PIXMAP_SYNC 256 /* set if GPU can DMA */
struct fb_pixmap {
u8 *addr; /* pointer to memory */
u32 size; /* size of buffer in bytes */
u32 offset; /* current offset to buffer */
u32 buf_align; /* byte alignment of each bitmap */
u32 scan_align; /* alignment per scanline */
u32 access_align; /* alignment per read/write (bits) */
u32 flags; /* see FB_PIXMAP_* */
u32 blit_x; /* supported bit block dimensions (1-32)*/
u32 blit_y; /* Format: blit_x = 1 << (width - 1) */
/* blit_y = 1 << (height - 1) */
/* if 0, will be set to 0xffffffff (all)*/
/* access methods */
void (*writeio)(struct fb_info *info, void __iomem *dst, void *src, unsigned int size);
void (*readio) (struct fb_info *info, void *dst, void __iomem *src, unsigned int size);
struct fb_deferred_io {
/* delay between mkwrite and deferred handler */
unsigned long delay;
struct mutex lock; /* mutex that protects the page list */
struct list_head pagelist; /* list of touched pages */
/* callback */
void (*first_io)(struct fb_info *info);
void (*deferred_io)(struct fb_info *info, struct list_head *pagelist);
* Frame buffer operations
* LOCKING NOTE: those functions must _ALL_ be called with the console
* semaphore held, this is the only suitable locking mechanism we have
* in 2.6. Some may be called at interrupt time at this point though.
* The exception to this is the debug related hooks. Putting the fb
* into a debug state (e.g. flipping to the kernel console) and restoring
* it must be done in a lock-free manner, so low level drivers should
* keep track of the initial console (if applicable) and may need to
* perform direct, unlocked hardware writes in these hooks.
struct fb_ops {
/* open/release and usage marking */
struct module *owner;
int (*fb_open)(struct fb_info *info, int user);
int (*fb_release)(struct fb_info *info, int user);
/* For framebuffers with strange non linear layouts or that do not
* work with normal memory mapped access
ssize_t (*fb_read)(struct fb_info *info, char __user *buf,
size_t count, loff_t *ppos);
ssize_t (*fb_write)(struct fb_info *info, const char __user *buf,
size_t count, loff_t *ppos);
/* checks var and eventually tweaks it to something supported,
int (*fb_check_var)(struct fb_var_screeninfo *var, struct fb_info *info);
/* set the video mode according to info->var */
int (*fb_set_par)(struct fb_info *info);
/* set color register */
int (*fb_setcolreg)(unsigned regno, unsigned red, unsigned green,
unsigned blue, unsigned transp, struct fb_info *info);
/* set color registers in batch */
int (*fb_setcmap)(struct fb_cmap *cmap, struct fb_info *info);
/* blank display */
int (*fb_blank)(int blank, struct fb_info *info);
/* pan display */
int (*fb_pan_display)(struct fb_var_screeninfo *var, struct fb_info *info);
/* Draws a rectangle */
void (*fb_fillrect) (struct fb_info *info, const struct fb_fillrect *rect);
/* Copy data from area to another */
void (*fb_copyarea) (struct fb_info *info, const struct fb_copyarea *region);
/* Draws a image to the display */
void (*fb_imageblit) (struct fb_info *info, const struct fb_image *image);
/* Draws cursor */
int (*fb_cursor) (struct fb_info *info, struct fb_cursor *cursor);
/* wait for blit idle, optional */
int (*fb_sync)(struct fb_info *info);
/* perform fb specific ioctl (optional) */
int (*fb_ioctl)(struct fb_info *info, unsigned int cmd,
unsigned long arg);
/* Handle 32bit compat ioctl (optional) */
int (*fb_compat_ioctl)(struct fb_info *info, unsigned cmd,
unsigned long arg);
/* perform fb specific mmap */
int (*fb_mmap)(struct fb_info *info, struct vm_area_struct *vma);
/* get capability given var */
void (*fb_get_caps)(struct fb_info *info, struct fb_blit_caps *caps,
struct fb_var_screeninfo *var);
/* teardown any resources to do with this framebuffer */
void (*fb_destroy)(struct fb_info *info);
/* called at KDB enter and leave time to prepare the console */
int (*fb_debug_enter)(struct fb_info *info);
int (*fb_debug_leave)(struct fb_info *info);
struct fb_tilemap {
__u32 width; /* width of each tile in pixels */
__u32 height; /* height of each tile in scanlines */
__u32 depth; /* color depth of each tile */
__u32 length; /* number of tiles in the map */
const __u8 *data; /* actual tile map: a bitmap array, packed
to the nearest byte */
struct fb_tilerect {
__u32 sx; /* origin in the x-axis */
__u32 sy; /* origin in the y-axis */
__u32 width; /* number of tiles in the x-axis */
__u32 height; /* number of tiles in the y-axis */
__u32 index; /* what tile to use: index to tile map */
__u32 fg; /* foreground color */
__u32 bg; /* background color */
__u32 rop; /* raster operation */
struct fb_tilearea {
__u32 sx; /* source origin in the x-axis */
__u32 sy; /* source origin in the y-axis */
__u32 dx; /* destination origin in the x-axis */
__u32 dy; /* destination origin in the y-axis */
__u32 width; /* number of tiles in the x-axis */
__u32 height; /* number of tiles in the y-axis */
struct fb_tileblit {
__u32 sx; /* origin in the x-axis */
__u32 sy; /* origin in the y-axis */
__u32 width; /* number of tiles in the x-axis */
__u32 height; /* number of tiles in the y-axis */
__u32 fg; /* foreground color */
__u32 bg; /* background color */
__u32 length; /* number of tiles to draw */
__u32 *indices; /* array of indices to tile map */
struct fb_tilecursor {
__u32 sx; /* cursor position in the x-axis */
__u32 sy; /* cursor position in the y-axis */
__u32 mode; /* 0 = erase, 1 = draw */
__u32 shape; /* see FB_TILE_CURSOR_* */
__u32 fg; /* foreground color */
__u32 bg; /* background color */
struct fb_tile_ops {
/* set tile characteristics */
void (*fb_settile)(struct fb_info *info, struct fb_tilemap *map);
/* all dimensions from hereon are in terms of tiles */
/* move a rectangular region of tiles from one area to another*/
void (*fb_tilecopy)(struct fb_info *info, struct fb_tilearea *area);
/* fill a rectangular region with a tile */
void (*fb_tilefill)(struct fb_info *info, struct fb_tilerect *rect);
/* copy an array of tiles */
void (*fb_tileblit)(struct fb_info *info, struct fb_tileblit *blit);
/* cursor */
void (*fb_tilecursor)(struct fb_info *info,
struct fb_tilecursor *cursor);
/* get maximum length of the tile map */
int (*fb_get_tilemax)(struct fb_info *info);
/* FBINFO_* = fb_info.flags bit flags */
* Hardware acceleration is turned off. Software implementations
* of required functions (copyarea(), fillrect(), and imageblit())
* takes over; acceleration engine should be in a quiescent state */
/* hints */
#define FBINFO_VIRTFB 0x0004 /* FB is System RAM, not device. */
#define FBINFO_PARTIAL_PAN_OK 0x0040 /* otw use pan only for double-buffering */
#define FBINFO_READS_FAST 0x0080 /* soft-copy faster than rendering */
/* hardware supported ops */
/* semantics: when a bit is set, it indicates that the operation is
* accelerated by hardware.
* required functions will still work even if the bit is not set.
* optional functions may not even exist if the flag bit is not set.
#define FBINFO_HWACCEL_NONE 0x0000
#define FBINFO_HWACCEL_COPYAREA 0x0100 /* required */
#define FBINFO_HWACCEL_FILLRECT 0x0200 /* required */
#define FBINFO_HWACCEL_IMAGEBLIT 0x0400 /* required */
#define FBINFO_HWACCEL_ROTATE 0x0800 /* optional */
#define FBINFO_HWACCEL_XPAN 0x1000 /* optional */
#define FBINFO_HWACCEL_YPAN 0x2000 /* optional */
#define FBINFO_HWACCEL_YWRAP 0x4000 /* optional */
#define FBINFO_MISC_USEREVENT 0x10000 /* event request
from userspace */
#define FBINFO_MISC_TILEBLITTING 0x20000 /* use tile blitting */
/* A driver may set this flag to indicate that it does want a set_par to be
* called every time when fbcon_switch is executed. The advantage is that with
* this flag set you can really be sure that set_par is always called before
* any of the functions dependent on the correct hardware state or altering
* that state, even if you are using some broken X releases. The disadvantage
* is that it introduces unwanted delays to every console switch if set_par
* is slow. It is a good idea to try this flag in the drivers initialization
* code whenever there is a bug report related to switching between X and the
* framebuffer console.
/* where the fb is a firmware driver, and can be replaced with a proper one */
#define FBINFO_MISC_FIRMWARE 0x80000
* Host and GPU endianness differ.
#define FBINFO_FOREIGN_ENDIAN 0x100000
* Big endian math. This is the same flags as above, but with different
* meaning, it is set by the fb subsystem depending FOREIGN_ENDIAN flag
* and host endianness. Drivers should not use this flag.
#define FBINFO_BE_MATH 0x100000
/* report to the VT layer that this fb driver can accept forced console
output like oopses */
#define FBINFO_CAN_FORCE_OUTPUT 0x200000
struct fb_info {
atomic_t count;
int node;
int flags;
* -1 by default, set to a FB_ROTATE_* value by the driver, if it knows
* a lcd is not mounted upright and fbcon should rotate to compensate.
int fbcon_rotate_hint;
struct mutex lock; /* Lock for open/release/ioctl funcs */
struct mutex mm_lock; /* Lock for fb_mmap and smem_* fields */
struct fb_var_screeninfo var; /* Current var */
struct fb_fix_screeninfo fix; /* Current fix */
struct fb_monspecs monspecs; /* Current Monitor specs */
struct work_struct queue; /* Framebuffer event queue */
struct fb_pixmap pixmap; /* Image hardware mapper */
struct fb_pixmap sprite; /* Cursor hardware mapper */
struct fb_cmap cmap; /* Current cmap */
struct list_head modelist; /* mode list */
struct fb_videomode *mode; /* current mode */
/* assigned backlight device */
/* set before framebuffer registration,
remove after unregister */
struct backlight_device *bl_dev;
/* Backlight level curve */
struct mutex bl_curve_mutex;
struct delayed_work deferred_work;
struct fb_deferred_io *fbdefio;
struct fb_ops *fbops;
struct device *device; /* This is the parent */
struct device *dev; /* This is this fb device */
int class_flag; /* private sysfs flags */
struct fb_tile_ops *tileops; /* Tile Blitting */
union {
char __iomem *screen_base; /* Virtual address */
char *screen_buffer;
unsigned long screen_size; /* Amount of ioremapped VRAM or 0 */
void *pseudo_palette; /* Fake palette of 16 colors */
u32 state; /* Hardware state i.e suspend */
void *fbcon_par; /* fbcon use-only private area */
/* From here on everything is device dependent */
void *par;
/* we need the PCI or similar aperture base/size not
smem_start/size as smem_start may just be an object
allocated inside the aperture so may not actually overlap */
struct apertures_struct {
unsigned int count;
struct aperture {
resource_size_t base;
resource_size_t size;
} ranges[0];
} *apertures;
bool skip_vt_switch; /* no VT switch on suspend/resume required */
static inline struct apertures_struct *alloc_apertures(unsigned int max_num) {
struct apertures_struct *a = kzalloc(sizeof(struct apertures_struct)
+ max_num * sizeof(struct aperture), GFP_KERNEL);
if (!a)
return NULL;
a->count = max_num;
return a;
/* This will go away
* fbset currently hacks in FB_ACCELF_TEXT into var.accel_flags
* when it wants to turn the acceleration engine on. This is
* really a separate operation, and should be modified via sysfs.
* But for now, we leave it broken with the following define
// This will go away
#if defined(__sparc__)
/* We map all of our framebuffers such that big-endian accesses
* are what we want, so the following is sufficient.
// This will go away
#define fb_readb sbus_readb
#define fb_readw sbus_readw
#define fb_readl sbus_readl
#define fb_readq sbus_readq
#define fb_writeb sbus_writeb
#define fb_writew sbus_writew
#define fb_writel sbus_writel
#define fb_writeq sbus_writeq
#define fb_memset sbus_memset_io
#define fb_memcpy_fromfb sbus_memcpy_fromio
#define fb_memcpy_tofb sbus_memcpy_toio
#elif defined(__i386__) || defined(__alpha__) || defined(__x86_64__) || \
defined(__hppa__) || defined(__sh__) || defined(__powerpc__) || \
defined(__arm__) || defined(__aarch64__)
#define fb_readb __raw_readb
#define fb_readw __raw_readw
#define fb_readl __raw_readl
#define fb_readq __raw_readq
#define fb_writeb __raw_writeb
#define fb_writew __raw_writew
#define fb_writel __raw_writel
#define fb_writeq __raw_writeq
#define fb_memset memset_io
#define fb_memcpy_fromfb memcpy_fromio
#define fb_memcpy_tofb memcpy_toio
#define fb_readb(addr) (*(volatile u8 *) (addr))
#define fb_readw(addr) (*(volatile u16 *) (addr))
#define fb_readl(addr) (*(volatile u32 *) (addr))
#define fb_readq(addr) (*(volatile u64 *) (addr))
#define fb_writeb(b,addr) (*(volatile u8 *) (addr) = (b))
#define fb_writew(b,addr) (*(volatile u16 *) (addr) = (b))
#define fb_writel(b,addr) (*(volatile u32 *) (addr) = (b))
#define fb_writeq(b,addr) (*(volatile u64 *) (addr) = (b))
#define fb_memset memset
#define fb_memcpy_fromfb memcpy
#define fb_memcpy_tofb memcpy
#define FB_LEFT_POS(p, bpp) (fb_be_math(p) ? (32 - (bpp)) : 0)
#define FB_SHIFT_HIGH(p, val, bits) (fb_be_math(p) ? (val) >> (bits) : \
(val) << (bits))
#define FB_SHIFT_LOW(p, val, bits) (fb_be_math(p) ? (val) << (bits) : \
(val) >> (bits))
* `Generic' versions of the frame buffer device operations
extern int fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var);
extern int fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var);
extern int fb_blank(struct fb_info *info, int blank);
extern void cfb_fillrect(struct fb_info *info, const struct fb_fillrect *rect);
extern void cfb_copyarea(struct fb_info *info, const struct fb_copyarea *area);
extern void cfb_imageblit(struct fb_info *info, const struct fb_image *image);
* Drawing operations where framebuffer is in system RAM
extern void sys_fillrect(struct fb_info *info, const struct fb_fillrect *rect);
extern void sys_copyarea(struct fb_info *info, const struct fb_copyarea *area);
extern void sys_imageblit(struct fb_info *info, const struct fb_image *image);
extern ssize_t fb_sys_read(struct fb_info *info, char __user *buf,
size_t count, loff_t *ppos);
extern ssize_t fb_sys_write(struct fb_info *info, const char __user *buf,
size_t count, loff_t *ppos);
/* drivers/video/fbmem.c */
extern int register_framebuffer(struct fb_info *fb_info);
extern int unregister_framebuffer(struct fb_info *fb_info);
extern int unlink_framebuffer(struct fb_info *fb_info);
extern int remove_conflicting_framebuffers(struct apertures_struct *a,
const char *name, bool primary);
extern int fb_prepare_logo(struct fb_info *fb_info, int rotate);
extern int fb_show_logo(struct fb_info *fb_info, int rotate);
extern char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size);
extern void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx,
u32 height, u32 shift_high, u32 shift_low, u32 mod);
extern void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height);
extern void fb_set_suspend(struct fb_info *info, int state);
extern int fb_get_color_depth(struct fb_var_screeninfo *var,
struct fb_fix_screeninfo *fix);
extern int fb_get_options(const char *name, char **option);
extern int fb_new_modelist(struct fb_info *info);
extern struct fb_info *registered_fb[FB_MAX];
extern int num_registered_fb;
extern struct class *fb_class;
#define for_each_registered_fb(i) \
for (i = 0; i < FB_MAX; i++) \
if (!registered_fb[i]) {} else
extern int lock_fb_info(struct fb_info *info);
static inline void unlock_fb_info(struct fb_info *info)
static inline void __fb_pad_aligned_buffer(u8 *dst, u32 d_pitch,
u8 *src, u32 s_pitch, u32 height)
u32 i, j;
d_pitch -= s_pitch;
for (i = height; i--; ) {
/* s_pitch is a few bytes at the most, memcpy is suboptimal */
for (j = 0; j < s_pitch; j++)
*dst++ = *src++;
dst += d_pitch;
/* drivers/video/fb_defio.c */
int fb_deferred_io_mmap(struct fb_info *info, struct vm_area_struct *vma);
extern void fb_deferred_io_init(struct fb_info *info);
extern void fb_deferred_io_open(struct fb_info *info,
struct inode *inode,
struct file *file);
extern void fb_deferred_io_cleanup(struct fb_info *info);
extern int fb_deferred_io_fsync(struct file *file, loff_t start,
loff_t end, int datasync);
static inline bool fb_be_math(struct fb_info *info)
return info->flags & FBINFO_BE_MATH;
#elif defined(CONFIG_FB_BIG_ENDIAN)
return true;
return false;
#ifdef __BIG_ENDIAN
return true;
return false;
#endif /* __BIG_ENDIAN */
/* drivers/video/fbsysfs.c */
extern struct fb_info *framebuffer_alloc(size_t size, struct device *dev);
extern void framebuffer_release(struct fb_info *info);
extern int fb_init_device(struct fb_info *fb_info);
extern void fb_cleanup_device(struct fb_info *head);
extern void fb_bl_default_curve(struct fb_info *fb_info, u8 off, u8 min, u8 max);
/* drivers/video/fbmon.c */
#define FB_IGNOREMON 0x100
#define FB_MODE_IS_VESA 4
#define FB_MODE_IS_FIRST 16
#define FB_MODE_IS_FROM_VAR 32
extern int fbmon_dpms(const struct fb_info *fb_info);
extern int fb_get_mode(int flags, u32 val, struct fb_var_screeninfo *var,
struct fb_info *info);
extern int fb_validate_mode(const struct fb_var_screeninfo *var,
struct fb_info *info);
extern int fb_parse_edid(unsigned char *edid, struct fb_var_screeninfo *var);
extern const unsigned char *fb_firmware_edid(struct device *device);
extern void fb_edid_to_monspecs(unsigned char *edid,
struct fb_monspecs *specs);
extern void fb_edid_add_monspecs(unsigned char *edid,
struct fb_monspecs *specs);
extern void fb_destroy_modedb(struct fb_videomode *modedb);
extern int fb_find_mode_cvt(struct fb_videomode *mode, int margins, int rb);
extern unsigned char *fb_ddc_read(struct i2c_adapter *adapter);
extern int of_get_fb_videomode(struct device_node *np,
struct fb_videomode *fb,
int index);
extern int fb_videomode_from_videomode(const struct videomode *vm,
struct fb_videomode *fbmode);
/* drivers/video/modedb.c */
#define DMT_SIZE 0x50
extern void fb_var_to_videomode(struct fb_videomode *mode,
const struct fb_var_screeninfo *var);
extern void fb_videomode_to_var(struct fb_var_screeninfo *var,
const struct fb_videomode *mode);
extern int fb_mode_is_equal(const struct fb_videomode *mode1,
const struct fb_videomode *mode2);
extern int fb_add_videomode(const struct fb_videomode *mode,
struct list_head *head);
extern void fb_delete_videomode(const struct fb_videomode *mode,
struct list_head *head);
extern const struct fb_videomode *fb_match_mode(const struct fb_var_screeninfo *var,
struct list_head *head);
extern const struct fb_videomode *fb_find_best_mode(const struct fb_var_screeninfo *var,
struct list_head *head);
extern const struct fb_videomode *fb_find_nearest_mode(const struct fb_videomode *mode,
struct list_head *head);
extern void fb_destroy_modelist(struct list_head *head);
extern void fb_videomode_to_modelist(const struct fb_videomode *modedb, int num,
struct list_head *head);
extern const struct fb_videomode *fb_find_best_display(const struct fb_monspecs *specs,
struct list_head *head);
/* drivers/video/fbcmap.c */
extern int fb_alloc_cmap(struct fb_cmap *cmap, int len, int transp);
extern int fb_alloc_cmap_gfp(struct fb_cmap *cmap, int len, int transp, gfp_t flags);
extern void fb_dealloc_cmap(struct fb_cmap *cmap);
extern int fb_copy_cmap(const struct fb_cmap *from, struct fb_cmap *to);
extern int fb_cmap_to_user(const struct fb_cmap *from, struct fb_cmap_user *to);
extern int fb_set_cmap(struct fb_cmap *cmap, struct fb_info *fb_info);
extern int fb_set_user_cmap(struct fb_cmap_user *cmap, struct fb_info *fb_info);
extern const struct fb_cmap *fb_default_cmap(int len);
extern void fb_invert_cmaps(void);
struct fb_videomode {
const char *name; /* optional */
u32 refresh; /* optional */
u32 xres;
u32 yres;
u32 pixclock;
u32 left_margin;
u32 right_margin;
u32 upper_margin;
u32 lower_margin;
u32 hsync_len;
u32 vsync_len;
u32 sync;
u32 vmode;
u32 flag;
struct dmt_videomode {
u32 dmt_id;
u32 std_2byte_code;
u32 cvt_3byte_code;
const struct fb_videomode *mode;
extern const char *fb_mode_option;
extern const struct fb_videomode vesa_modes[];
extern const struct fb_videomode cea_modes[65];
extern const struct dmt_videomode dmt_modes[];
struct fb_modelist {
struct list_head list;
struct fb_videomode mode;
extern int fb_find_mode(struct fb_var_screeninfo *var,
struct fb_info *info, const char *mode_option,
const struct fb_videomode *db,
unsigned int dbsize,
const struct fb_videomode *default_mode,
unsigned int default_bpp);
/* Convenience logging macros */
#define fb_err(fb_info, fmt, ...) \
pr_err("fb%d: " fmt, (fb_info)->node, ##__VA_ARGS__)
#define fb_notice(info, fmt, ...) \
pr_notice("fb%d: " fmt, (fb_info)->node, ##__VA_ARGS__)
#define fb_warn(fb_info, fmt, ...) \
pr_warn("fb%d: " fmt, (fb_info)->node, ##__VA_ARGS__)
#define fb_info(fb_info, fmt, ...) \
pr_info("fb%d: " fmt, (fb_info)->node, ##__VA_ARGS__)
#define fb_dbg(fb_info, fmt, ...) \
pr_debug("fb%d: " fmt, (fb_info)->node, ##__VA_ARGS__)
#endif /* _LINUX_FB_H */