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  1. /*
  2.  * fbsysfs.c - framebuffer device class and attributes
  3.  *
  4.  * Copyright (c) 2004 James Simmons <jsimmons@infradead.org>
  5.  *
  6.  *      This program is free software you can redistribute it and/or
  7.  *      modify it under the terms of the GNU General Public License
  8.  *      as published by the Free Software Foundation; either version
  9.  *      2 of the License, or (at your option) any later version.
  10.  */
  11.  
  12. /*
  13.  * Note:  currently there's only stubs for framebuffer_alloc and
  14.  * framebuffer_release here.  The reson for that is that until all drivers
  15.  * are converted to use it a sysfsification will open OOPSable races.
  16.  */
  17.  
  18. #include <linux/kernel.h>
  19. #include <linux/slab.h>
  20. #include <linux/fb.h>
  21. #include <linux/module.h>
  22.  
  23. #define FB_SYSFS_FLAG_ATTR 1
  24.  
  25. /**
  26.  * framebuffer_alloc - creates a new frame buffer info structure
  27.  *
  28.  * @size: size of driver private data, can be zero
  29.  * @dev: pointer to the device for this fb, this can be NULL
  30.  *
  31.  * Creates a new frame buffer info structure. Also reserves @size bytes
  32.  * for driver private data (info->par). info->par (if any) will be
  33.  * aligned to sizeof(long).
  34.  *
  35.  * Returns the new structure, or NULL if an error occurred.
  36.  *
  37.  */
  38. struct fb_info *framebuffer_alloc(size_t size, struct device *dev)
  39. {
  40. #define BYTES_PER_LONG (BITS_PER_LONG/8)
  41. #define PADDING (BYTES_PER_LONG - (sizeof(struct fb_info) % BYTES_PER_LONG))
  42.         int fb_info_size = sizeof(struct fb_info);
  43.         struct fb_info *info;
  44.         char *p;
  45.  
  46.         if (size)
  47.                 fb_info_size += PADDING;
  48.  
  49.         p = kzalloc(fb_info_size + size, GFP_KERNEL);
  50.  
  51.         if (!p)
  52.                 return NULL;
  53.  
  54.         info = (struct fb_info *) p;
  55.  
  56.         if (size)
  57.                 info->par = p + fb_info_size;
  58.  
  59.         info->device = dev;
  60.  
  61. #ifdef CONFIG_FB_BACKLIGHT
  62.         mutex_init(&info->bl_curve_mutex);
  63. #endif
  64.  
  65.         return info;
  66. #undef PADDING
  67. #undef BYTES_PER_LONG
  68. }
  69. EXPORT_SYMBOL(framebuffer_alloc);
  70.  
  71. /**
  72.  * framebuffer_release - marks the structure available for freeing
  73.  *
  74.  * @info: frame buffer info structure
  75.  *
  76.  * Drop the reference count of the device embedded in the
  77.  * framebuffer info structure.
  78.  *
  79.  */
  80. void framebuffer_release(struct fb_info *info)
  81. {
  82.         if (!info)
  83.                 return;
  84.         kfree(info->apertures);
  85.         kfree(info);
  86. }
  87. EXPORT_SYMBOL(framebuffer_release);
  88.