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