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drivers/video/fbcmap.c
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/* * linux/drivers/video/fbcmap.c -- Colormap handling for frame buffer devices * * Created 15 Jun 1997 by Geert Uytterhoeven * * 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/string.h> #include <linux/module.h> |
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#include <linux/fb.h> #include <linux/slab.h> |
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#include <linux/uaccess.h> |
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static u16 red2[] __read_mostly = { |
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0x0000, 0xaaaa }; |
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static u16 green2[] __read_mostly = { |
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0x0000, 0xaaaa }; |
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static u16 blue2[] __read_mostly = { |
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0x0000, 0xaaaa }; |
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static u16 red4[] __read_mostly = { |
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0x0000, 0xaaaa, 0x5555, 0xffff }; |
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static u16 green4[] __read_mostly = { |
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0x0000, 0xaaaa, 0x5555, 0xffff }; |
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static u16 blue4[] __read_mostly = { |
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0x0000, 0xaaaa, 0x5555, 0xffff }; |
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static u16 red8[] __read_mostly = { |
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0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa }; |
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static u16 green8[] __read_mostly = { |
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0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa }; |
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static u16 blue8[] __read_mostly = { |
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0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa }; |
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static u16 red16[] __read_mostly = { |
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0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa, 0x5555, 0x5555, 0x5555, 0x5555, 0xffff, 0xffff, 0xffff, 0xffff }; |
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static u16 green16[] __read_mostly = { |
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0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa, 0x5555, 0x5555, 0xffff, 0xffff, 0x5555, 0x5555, 0xffff, 0xffff }; |
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static u16 blue16[] __read_mostly = { |
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0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff }; |
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static const struct fb_cmap default_2_colors = { .len=2, .red=red2, .green=green2, .blue=blue2 |
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}; |
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static const struct fb_cmap default_8_colors = { .len=8, .red=red8, .green=green8, .blue=blue8 |
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}; |
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static const struct fb_cmap default_4_colors = { .len=4, .red=red4, .green=green4, .blue=blue4 |
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}; |
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static const struct fb_cmap default_16_colors = { .len=16, .red=red16, .green=green16, .blue=blue16 |
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}; |
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/** * fb_alloc_cmap - allocate a colormap * @cmap: frame buffer colormap structure * @len: length of @cmap * @transp: boolean, 1 if there is transparency, 0 otherwise |
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* @flags: flags for kmalloc memory allocation |
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* * Allocates memory for a colormap @cmap. @len is the * number of entries in the palette. * |
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* Returns negative errno on error, or zero on success. |
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* */ |
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int fb_alloc_cmap_gfp(struct fb_cmap *cmap, int len, int transp, gfp_t flags) |
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{ |
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int size = len * sizeof(u16); |
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int ret = -ENOMEM; |
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if (cmap->len != len) { fb_dealloc_cmap(cmap); if (!len) return 0; |
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cmap->red = kmalloc(size, flags); |
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if (!cmap->red) goto fail; |
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cmap->green = kmalloc(size, flags); |
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if (!cmap->green) goto fail; |
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cmap->blue = kmalloc(size, flags); |
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if (!cmap->blue) goto fail; if (transp) { |
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cmap->transp = kmalloc(size, flags); |
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if (!cmap->transp) goto fail; } else { cmap->transp = NULL; } } cmap->start = 0; cmap->len = len; |
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ret = fb_copy_cmap(fb_default_cmap(len), cmap); if (ret) goto fail; |
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return 0; |
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fail: |
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fb_dealloc_cmap(cmap); |
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return ret; } int fb_alloc_cmap(struct fb_cmap *cmap, int len, int transp) { return fb_alloc_cmap_gfp(cmap, len, transp, GFP_ATOMIC); |
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} /** * fb_dealloc_cmap - deallocate a colormap * @cmap: frame buffer colormap structure * * Deallocates a colormap that was previously allocated with * fb_alloc_cmap(). * */ void fb_dealloc_cmap(struct fb_cmap *cmap) { kfree(cmap->red); kfree(cmap->green); kfree(cmap->blue); kfree(cmap->transp); cmap->red = cmap->green = cmap->blue = cmap->transp = NULL; cmap->len = 0; } /** * fb_copy_cmap - copy a colormap * @from: frame buffer colormap structure * @to: frame buffer colormap structure * * Copy contents of colormap from @from to @to. */ |
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int fb_copy_cmap(const struct fb_cmap *from, struct fb_cmap *to) |
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{ int tooff = 0, fromoff = 0; int size; if (to->start > from->start) fromoff = to->start - from->start; else tooff = from->start - to->start; size = to->len - tooff; if (size > (int) (from->len - fromoff)) size = from->len - fromoff; if (size <= 0) return -EINVAL; size *= sizeof(u16); memcpy(to->red+tooff, from->red+fromoff, size); memcpy(to->green+tooff, from->green+fromoff, size); memcpy(to->blue+tooff, from->blue+fromoff, size); if (from->transp && to->transp) memcpy(to->transp+tooff, from->transp+fromoff, size); return 0; } |
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int fb_cmap_to_user(const struct fb_cmap *from, struct fb_cmap_user *to) |
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{ int tooff = 0, fromoff = 0; int size; if (to->start > from->start) fromoff = to->start - from->start; else tooff = from->start - to->start; size = to->len - tooff; if (size > (int) (from->len - fromoff)) size = from->len - fromoff; if (size <= 0) return -EINVAL; size *= sizeof(u16); if (copy_to_user(to->red+tooff, from->red+fromoff, size)) return -EFAULT; if (copy_to_user(to->green+tooff, from->green+fromoff, size)) return -EFAULT; if (copy_to_user(to->blue+tooff, from->blue+fromoff, size)) return -EFAULT; if (from->transp && to->transp) if (copy_to_user(to->transp+tooff, from->transp+fromoff, size)) return -EFAULT; return 0; } /** * fb_set_cmap - set the colormap * @cmap: frame buffer colormap structure * @info: frame buffer info structure * * Sets the colormap @cmap for a screen of device @info. * * Returns negative errno on error, or zero on success. * */ int fb_set_cmap(struct fb_cmap *cmap, struct fb_info *info) { |
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int i, start, rc = 0; |
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u16 *red, *green, *blue, *transp; u_int hred, hgreen, hblue, htransp = 0xffff; red = cmap->red; green = cmap->green; blue = cmap->blue; transp = cmap->transp; start = cmap->start; |
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if (start < 0 || (!info->fbops->fb_setcolreg && !info->fbops->fb_setcmap)) |
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return -EINVAL; |
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if (info->fbops->fb_setcmap) { rc = info->fbops->fb_setcmap(cmap, info); } else { for (i = 0; i < cmap->len; i++) { hred = *red++; hgreen = *green++; hblue = *blue++; if (transp) htransp = *transp++; if (info->fbops->fb_setcolreg(start++, hred, hgreen, hblue, htransp, info)) break; } |
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} |
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if (rc == 0) fb_copy_cmap(cmap, &info->cmap); return rc; |
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} int fb_set_user_cmap(struct fb_cmap_user *cmap, struct fb_info *info) { |
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int rc, size = cmap->len * sizeof(u16); struct fb_cmap umap; |
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if (size < 0 || size < cmap->len) return -E2BIG; |
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memset(&umap, 0, sizeof(struct fb_cmap)); |
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rc = fb_alloc_cmap_gfp(&umap, cmap->len, cmap->transp != NULL, GFP_KERNEL); |
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if (rc) |
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return rc; |
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if (copy_from_user(umap.red, cmap->red, size) || copy_from_user(umap.green, cmap->green, size) || copy_from_user(umap.blue, cmap->blue, size) || (cmap->transp && copy_from_user(umap.transp, cmap->transp, size))) { |
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rc = -EFAULT; goto out; |
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} |
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umap.start = cmap->start; |
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if (!lock_fb_info(info)) { rc = -ENODEV; goto out; } if (cmap->start < 0 || (!info->fbops->fb_setcolreg && !info->fbops->fb_setcmap)) { rc = -EINVAL; goto out1; } |
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rc = fb_set_cmap(&umap, info); |
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out1: unlock_fb_info(info); out: |
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fb_dealloc_cmap(&umap); return rc; |
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} /** * fb_default_cmap - get default colormap * @len: size of palette for a depth * * Gets the default colormap for a specific screen depth. @len * is the size of the palette for a particular screen depth. * * Returns pointer to a frame buffer colormap structure. * */ |
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const struct fb_cmap *fb_default_cmap(int len) |
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{ if (len <= 2) return &default_2_colors; if (len <= 4) return &default_4_colors; if (len <= 8) return &default_8_colors; return &default_16_colors; } /** * fb_invert_cmaps - invert all defaults colormaps * * Invert all default colormaps. * */ void fb_invert_cmaps(void) { u_int i; |
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for (i = 0; i < ARRAY_SIZE(red2); i++) { |
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red2[i] = ~red2[i]; green2[i] = ~green2[i]; blue2[i] = ~blue2[i]; } |
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for (i = 0; i < ARRAY_SIZE(red4); i++) { |
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red4[i] = ~red4[i]; green4[i] = ~green4[i]; blue4[i] = ~blue4[i]; } |
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for (i = 0; i < ARRAY_SIZE(red8); i++) { |
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red8[i] = ~red8[i]; green8[i] = ~green8[i]; blue8[i] = ~blue8[i]; } |
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for (i = 0; i < ARRAY_SIZE(red16); i++) { |
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red16[i] = ~red16[i]; green16[i] = ~green16[i]; blue16[i] = ~blue16[i]; } } /* * Visible symbols for modules */ EXPORT_SYMBOL(fb_alloc_cmap); EXPORT_SYMBOL(fb_dealloc_cmap); EXPORT_SYMBOL(fb_copy_cmap); EXPORT_SYMBOL(fb_set_cmap); EXPORT_SYMBOL(fb_default_cmap); EXPORT_SYMBOL(fb_invert_cmaps); |