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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6295 | serge | 1 | /* |
| 2 | * fbsysfs.c - framebuffer device class and attributes |
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| 3 | * |
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| 4 | * Copyright (c) 2004 James Simmons |
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| 5 | * |
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| 6 | * This program is free software you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU General Public License |
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| 8 | * as published by the Free Software Foundation; either version |
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| 9 | * 2 of the License, or (at your option) any later version. |
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| 10 | */ |
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| 11 | |||
| 12 | /* |
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| 13 | * Note: currently there's only stubs for framebuffer_alloc and |
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| 14 | * framebuffer_release here. The reson for that is that until all drivers |
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| 15 | * are converted to use it a sysfsification will open OOPSable races. |
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| 16 | */ |
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| 17 | |||
| 18 | #include |
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| 19 | #include |
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| 20 | #include |
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| 21 | #include |
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| 22 | |||
| 23 | #define FB_SYSFS_FLAG_ATTR 1 |
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| 24 | |||
| 25 | /** |
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| 26 | * framebuffer_alloc - creates a new frame buffer info structure |
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| 27 | * |
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| 28 | * @size: size of driver private data, can be zero |
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| 29 | * @dev: pointer to the device for this fb, this can be NULL |
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| 30 | * |
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| 31 | * Creates a new frame buffer info structure. Also reserves @size bytes |
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| 32 | * for driver private data (info->par). info->par (if any) will be |
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| 33 | * aligned to sizeof(long). |
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| 34 | * |
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| 35 | * Returns the new structure, or NULL if an error occurred. |
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| 36 | * |
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| 37 | */ |
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| 38 | struct fb_info *framebuffer_alloc(size_t size, struct device *dev) |
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| 39 | { |
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| 40 | #define BYTES_PER_LONG (BITS_PER_LONG/8) |
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| 41 | #define PADDING (BYTES_PER_LONG - (sizeof(struct fb_info) % BYTES_PER_LONG)) |
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| 42 | int fb_info_size = sizeof(struct fb_info); |
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| 43 | struct fb_info *info; |
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| 44 | char *p; |
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| 45 | |||
| 46 | if (size) |
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| 47 | fb_info_size += PADDING; |
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| 48 | |||
| 49 | p = kzalloc(fb_info_size + size, GFP_KERNEL); |
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| 50 | |||
| 51 | if (!p) |
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| 52 | return NULL; |
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| 53 | |||
| 54 | info = (struct fb_info *) p; |
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| 55 | |||
| 56 | if (size) |
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| 57 | info->par = p + fb_info_size; |
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| 58 | |||
| 59 | info->device = dev; |
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| 60 | |||
| 61 | #ifdef CONFIG_FB_BACKLIGHT |
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| 62 | mutex_init(&info->bl_curve_mutex); |
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| 63 | #endif |
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| 64 | |||
| 65 | return info; |
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| 66 | #undef PADDING |
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| 67 | #undef BYTES_PER_LONG |
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| 68 | } |
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| 69 | EXPORT_SYMBOL(framebuffer_alloc); |
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| 70 | |||
| 71 | /** |
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| 72 | * framebuffer_release - marks the structure available for freeing |
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| 73 | * |
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| 74 | * @info: frame buffer info structure |
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| 75 | * |
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| 76 | * Drop the reference count of the device embedded in the |
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| 77 | * framebuffer info structure. |
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| 78 | * |
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| 79 | */ |
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| 80 | void framebuffer_release(struct fb_info *info) |
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| 81 | { |
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| 82 | if (!info) |
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| 83 | return; |
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| 84 | kfree(info->apertures); |
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| 85 | kfree(info); |
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| 86 | } |
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| 87 | EXPORT_SYMBOL(framebuffer_release); |