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[PATCH] fbdev: statically link the framebuffer notification functions 

The backlight and lcd subsystems can be notified by the framebuffer layer
of blanking events.  However, these subsystems, as a whole, can function
independently from the framebuffer layer.  But in order to enable to the
lcd and backlight subsystems, the framebuffer has to be compiled also,
effectively sucking in a huge amount of unneeded code.

To prevent dependency problems, separate out the framebuffer notification
mechanism from the framebuffer layer and permanently link it to the kernel.

Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Antonino A. Daplas 2006-07-30 03:04:17 -07:00 committed by Linus Torvalds
parent 834a9b8ca7
commit 256154fbc3
6 changed files with 62 additions and 47 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/video/Kconfig
View File

@ -1620,7 +1620,7 @@ if FB || SGI_NEWPORT_CONSOLE
source "drivers/video/logo/Kconfig"
endif
if FB && SYSFS
if SYSFS
source "drivers/video/backlight/Kconfig"
endif

1
drivers/video/Makefile
View File

@ -4,6 +4,7 @@
# Each configuration option enables a list of files.
obj-y += fb_notify.o
obj-$(CONFIG_FB) += fb.o
fb-y := fbmem.o fbmon.o fbcmap.o fbsysfs.o \
modedb.o fbcvt.o

4
drivers/video/backlight/Kconfig
View File

@ -10,7 +10,7 @@ menuconfig BACKLIGHT_LCD_SUPPORT
config BACKLIGHT_CLASS_DEVICE
tristate "Lowlevel Backlight controls"
depends on BACKLIGHT_LCD_SUPPORT && FB
depends on BACKLIGHT_LCD_SUPPORT
default m
help
This framework adds support for low-level control of the LCD
@ -26,7 +26,7 @@ config BACKLIGHT_DEVICE
config LCD_CLASS_DEVICE
tristate "Lowlevel LCD controls"
depends on BACKLIGHT_LCD_SUPPORT && FB
depends on BACKLIGHT_LCD_SUPPORT
default m
help
This framework adds support for low-level control of LCD.

46
drivers/video/fb_notify.c Normal file
View File

@ -0,0 +1,46 @@
/*
* linux/drivers/video/fb_notify.c
*
* Copyright (C) 2006 Antonino Daplas <adaplas@pol.net>
*
* 2001 - Documented with DocBook
* - Brad Douglas <brad@neruo.com>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*/
#include <linux/fb.h>
#include <linux/notifier.h>
static BLOCKING_NOTIFIER_HEAD(fb_notifier_list);
/**
* fb_register_client - register a client notifier
* @nb: notifier block to callback on events
*/
int fb_register_client(struct notifier_block *nb)
{
return blocking_notifier_chain_register(&fb_notifier_list, nb);
}
EXPORT_SYMBOL(fb_register_client);
/**
* fb_unregister_client - unregister a client notifier
* @nb: notifier block to callback on events
*/
int fb_unregister_client(struct notifier_block *nb)
{
return blocking_notifier_chain_unregister(&fb_notifier_list, nb);
}
EXPORT_SYMBOL(fb_unregister_client);
/**
* fb_notifier_call_chain - notify clients of fb_events
*
*/
int fb_notifier_call_chain(unsigned long val, void *v)
{
return blocking_notifier_call_chain(&fb_notifier_list, val, v);
}
EXPORT_SYMBOL_GPL(fb_notifier_call_chain);

54
drivers/video/fbmem.c
View File

@ -52,7 +52,6 @@
#define FBPIXMAPSIZE (1024 * 8)
static BLOCKING_NOTIFIER_HEAD(fb_notifier_list);
struct fb_info *registered_fb[FB_MAX];
int num_registered_fb;
@ -791,8 +790,7 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
event.info = info;
event.data = &mode1;
ret = blocking_notifier_call_chain(&fb_notifier_list,
FB_EVENT_MODE_DELETE, &event);
ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
}
if (!ret)
@ -837,8 +835,7 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
info->flags &= ~FBINFO_MISC_USEREVENT;
event.info = info;
blocking_notifier_call_chain(&fb_notifier_list,
evnt, &event);
fb_notifier_call_chain(evnt, &event);
}
}
}
@ -861,8 +858,7 @@ fb_blank(struct fb_info *info, int blank)
event.info = info;
event.data = &blank;
blocking_notifier_call_chain(&fb_notifier_list,
FB_EVENT_BLANK, &event);
fb_notifier_call_chain(FB_EVENT_BLANK, &event);
}
return ret;
@ -933,8 +929,7 @@ fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
con2fb.framebuffer = -1;
event.info = info;
event.data = &con2fb;
blocking_notifier_call_chain(&fb_notifier_list,
FB_EVENT_GET_CONSOLE_MAP, &event);
fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
return copy_to_user(argp, &con2fb,
sizeof(con2fb)) ? -EFAULT : 0;
case FBIOPUT_CON2FBMAP:
@ -952,9 +947,8 @@ fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
return -EINVAL;
event.info = info;
event.data = &con2fb;
return blocking_notifier_call_chain(&fb_notifier_list,
FB_EVENT_SET_CONSOLE_MAP,
&event);
return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,
&event);
case FBIOBLANK:
acquire_console_sem();
info->flags |= FBINFO_MISC_USEREVENT;
@ -1330,8 +1324,7 @@ register_framebuffer(struct fb_info *fb_info)
registered_fb[i] = fb_info;
event.info = fb_info;
blocking_notifier_call_chain(&fb_notifier_list,
FB_EVENT_FB_REGISTERED, &event);
fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
return 0;
}
@ -1365,29 +1358,10 @@ unregister_framebuffer(struct fb_info *fb_info)
fb_cleanup_class_device(fb_info);
class_device_destroy(fb_class, MKDEV(FB_MAJOR, i));
event.info = fb_info;
blocking_notifier_call_chain(&fb_notifier_list,
FB_EVENT_FB_UNREGISTERED, &event);
fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
return 0;
}
/**
* fb_register_client - register a client notifier
* @nb: notifier block to callback on events
*/
int fb_register_client(struct notifier_block *nb)
{
return blocking_notifier_chain_register(&fb_notifier_list, nb);
}
/**
* fb_unregister_client - unregister a client notifier
* @nb: notifier block to callback on events
*/
int fb_unregister_client(struct notifier_block *nb)
{
return blocking_notifier_chain_unregister(&fb_notifier_list, nb);
}
/**
* fb_set_suspend - low level driver signals suspend
* @info: framebuffer affected
@ -1403,13 +1377,11 @@ void fb_set_suspend(struct fb_info *info, int state)
event.info = info;
if (state) {
blocking_notifier_call_chain(&fb_notifier_list,
FB_EVENT_SUSPEND, &event);
fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
info->state = FBINFO_STATE_SUSPENDED;
} else {
info->state = FBINFO_STATE_RUNNING;
blocking_notifier_call_chain(&fb_notifier_list,
FB_EVENT_RESUME, &event);
fb_notifier_call_chain(FB_EVENT_RESUME, &event);
}
}
@ -1480,9 +1452,7 @@ int fb_new_modelist(struct fb_info *info)
if (!list_empty(&info->modelist)) {
event.info = info;
err = blocking_notifier_call_chain(&fb_notifier_list,
FB_EVENT_NEW_MODELIST,
&event);
err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
}
return err;
@ -1594,8 +1564,6 @@ EXPORT_SYMBOL(fb_blank);
EXPORT_SYMBOL(fb_pan_display);
EXPORT_SYMBOL(fb_get_buffer_offset);
EXPORT_SYMBOL(fb_set_suspend);
EXPORT_SYMBOL(fb_register_client);
EXPORT_SYMBOL(fb_unregister_client);
EXPORT_SYMBOL(fb_get_options);
MODULE_LICENSE("GPL");

2
include/linux/fb.h
View File

@ -524,7 +524,7 @@ struct fb_event {
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);
/*
* Pixmap structure definition
*