Commit 256154fb authored by Antonino A. Daplas's avatar Antonino A. Daplas Committed by Linus Torvalds
Browse files

[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: default avatarAntonino Daplas <adaplas@pol.net>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 834a9b8c

drivers/video/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -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

drivers/video/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/video/backlight/Kconfig

+2 −2
Original line number Diff line number Diff line
@@ -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.

drivers/video/fb_notify.c

0 → 100644
+46 −0
Original line number Diff line number Diff line 
/*

 *  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);

drivers/video/fbmem.c

+11 −43
Original line number Diff line number Diff line
@@ -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:
@@ -952,8 +947,7 @@ 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,

		return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP,

					      &event);

	case FBIOBLANK:

		acquire_console_sem();
@@ -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");

CRA Git | Maintained and supported by SUSTech CRA and CCSE