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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364/* * 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/export.h>#include <linux/string.h>#include <linux/module.h>#include <linux/fb.h>#include <linux/slab.h>#include <linux/uaccess.h>
static u16 red2[] __read_mostly = { 0x0000, 0xaaaa};static u16 green2[] __read_mostly = { 0x0000, 0xaaaa};static u16 blue2[] __read_mostly = { 0x0000, 0xaaaa};
static u16 red4[] __read_mostly = { 0x0000, 0xaaaa, 0x5555, 0xffff};static u16 green4[] __read_mostly = { 0x0000, 0xaaaa, 0x5555, 0xffff};static u16 blue4[] __read_mostly = { 0x0000, 0xaaaa, 0x5555, 0xffff};
static u16 red8[] __read_mostly = { 0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa};static u16 green8[] __read_mostly = { 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa};static u16 blue8[] __read_mostly = { 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa};
static u16 red16[] __read_mostly = { 0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa, 0x5555, 0x5555, 0x5555, 0x5555, 0xffff, 0xffff, 0xffff, 0xffff};static u16 green16[] __read_mostly = { 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa, 0x5555, 0x5555, 0xffff, 0xffff, 0x5555, 0x5555, 0xffff, 0xffff};static u16 blue16[] __read_mostly = { 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff};
static const struct fb_cmap default_2_colors = { .len=2, .red=red2, .green=green2, .blue=blue2};static const struct fb_cmap default_8_colors = { .len=8, .red=red8, .green=green8, .blue=blue8};static const struct fb_cmap default_4_colors = { .len=4, .red=red4, .green=green4, .blue=blue4};static const struct fb_cmap default_16_colors = { .len=16, .red=red16, .green=green16, .blue=blue16};
/** * fb_alloc_cmap_gfp - allocate a colormap * @cmap: frame buffer colormap structure * @len: length of @cmap * @transp: boolean, 1 if there is transparency, 0 otherwise * @flags: flags for kmalloc memory allocation * * Allocates memory for a colormap @cmap. @len is the * number of entries in the palette. * * Returns negative errno on error, or zero on success. * */
int fb_alloc_cmap_gfp(struct fb_cmap *cmap, int len, int transp, gfp_t flags){ int size = len * sizeof(u16); int ret = -ENOMEM;
flags |= __GFP_NOWARN;
if (cmap->len != len) { fb_dealloc_cmap(cmap); if (!len) return 0;
cmap->red = kzalloc(size, flags); if (!cmap->red) goto fail; cmap->green = kzalloc(size, flags); if (!cmap->green) goto fail; cmap->blue = kzalloc(size, flags); if (!cmap->blue) goto fail; if (transp) { cmap->transp = kzalloc(size, flags); if (!cmap->transp) goto fail; } else { cmap->transp = NULL; } } cmap->start = 0; cmap->len = len; ret = fb_copy_cmap(fb_default_cmap(len), cmap); if (ret) goto fail; return 0;
fail: fb_dealloc_cmap(cmap); return ret;}
int fb_alloc_cmap(struct fb_cmap *cmap, int len, int transp){ return fb_alloc_cmap_gfp(cmap, len, transp, GFP_ATOMIC);}
/** * 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. */
int fb_copy_cmap(const struct fb_cmap *from, struct fb_cmap *to){ unsigned int tooff = 0, fromoff = 0; size_t size;
if (to->start > from->start) fromoff = to->start - from->start; else tooff = from->start - to->start; if (fromoff >= from->len || tooff >= to->len) return -EINVAL;
size = min_t(size_t, to->len - tooff, 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;}
int fb_cmap_to_user(const struct fb_cmap *from, struct fb_cmap_user *to){ unsigned int tooff = 0, fromoff = 0; size_t size;
if (to->start > from->start) fromoff = to->start - from->start; else tooff = from->start - to->start; if (fromoff >= from->len || tooff >= to->len) return -EINVAL;
size = min_t(size_t, to->len - tooff, 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){ int i, start, rc = 0; 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;
if (start < 0 || (!info->fbops->fb_setcolreg && !info->fbops->fb_setcmap)) return -EINVAL; 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; } } if (rc == 0) fb_copy_cmap(cmap, &info->cmap);
return rc;}
int fb_set_user_cmap(struct fb_cmap_user *cmap, struct fb_info *info){ int rc, size = cmap->len * sizeof(u16); struct fb_cmap umap;
if (size < 0 || size < cmap->len) return -E2BIG;
memset(&umap, 0, sizeof(struct fb_cmap)); rc = fb_alloc_cmap_gfp(&umap, cmap->len, cmap->transp != NULL, GFP_KERNEL); if (rc) return rc; 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))) { rc = -EFAULT; goto out; } umap.start = cmap->start; lock_fb_info(info); rc = fb_set_cmap(&umap, info); unlock_fb_info(info);out: fb_dealloc_cmap(&umap); return rc;}
/** * 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. * */
const struct fb_cmap *fb_default_cmap(int len){ 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;
for (i = 0; i < ARRAY_SIZE(red2); i++) { red2[i] = ~red2[i]; green2[i] = ~green2[i]; blue2[i] = ~blue2[i]; } for (i = 0; i < ARRAY_SIZE(red4); i++) { red4[i] = ~red4[i]; green4[i] = ~green4[i]; blue4[i] = ~blue4[i]; } for (i = 0; i < ARRAY_SIZE(red8); i++) { red8[i] = ~red8[i]; green8[i] = ~green8[i]; blue8[i] = ~blue8[i]; } for (i = 0; i < ARRAY_SIZE(red16); i++) { 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);