kolibrios/drivers/ddk/linux/fbsysfs.c

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/*
* fbsysfs.c - framebuffer device class and attributes
*
* Copyright (c) 2004 James Simmons <jsimmons@infradead.org>
*
* This program is free software you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
/*
* Note: currently there's only stubs for framebuffer_alloc and
* framebuffer_release here. The reson for that is that until all drivers
* are converted to use it a sysfsification will open OOPSable races.
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/fb.h>
#include <linux/module.h>
#define FB_SYSFS_FLAG_ATTR 1
/**
* framebuffer_alloc - creates a new frame buffer info structure
*
* @size: size of driver private data, can be zero
* @dev: pointer to the device for this fb, this can be NULL
*
* Creates a new frame buffer info structure. Also reserves @size bytes
* for driver private data (info->par). info->par (if any) will be
* aligned to sizeof(long).
*
* Returns the new structure, or NULL if an error occurred.
*
*/
struct fb_info *framebuffer_alloc(size_t size, struct device *dev)
{
#define BYTES_PER_LONG (BITS_PER_LONG/8)
#define PADDING (BYTES_PER_LONG - (sizeof(struct fb_info) % BYTES_PER_LONG))
int fb_info_size = sizeof(struct fb_info);
struct fb_info *info;
char *p;
if (size)
fb_info_size += PADDING;
p = kzalloc(fb_info_size + size, GFP_KERNEL);
if (!p)
return NULL;
info = (struct fb_info *) p;
if (size)
info->par = p + fb_info_size;
info->device = dev;
#ifdef CONFIG_FB_BACKLIGHT
mutex_init(&info->bl_curve_mutex);
#endif
return info;
#undef PADDING
#undef BYTES_PER_LONG
}
EXPORT_SYMBOL(framebuffer_alloc);
/**
* framebuffer_release - marks the structure available for freeing
*
* @info: frame buffer info structure
*
* Drop the reference count of the device embedded in the
* framebuffer info structure.
*
*/
void framebuffer_release(struct fb_info *info)
{
if (!info)
return;
kfree(info->apertures);
kfree(info);
}
EXPORT_SYMBOL(framebuffer_release);