X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fvideo%2Ffbdev%2Fcore%2Ffbcmap.c;fp=kernel%2Fdrivers%2Fvideo%2Ffbdev%2Fcore%2Ffbcmap.c;h=f89245b8ba8e9a28483c4ff5edb03b80a1a9b2e3;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git diff --git a/kernel/drivers/video/fbdev/core/fbcmap.c b/kernel/drivers/video/fbdev/core/fbcmap.c new file mode 100644 index 000000000..f89245b8b --- /dev/null +++ b/kernel/drivers/video/fbdev/core/fbcmap.c @@ -0,0 +1,362 @@ +/* + * linux/drivers/video/fbcmap.c -- Colormap handling for frame buffer devices + * + * Created 15 Jun 1997 by Geert Uytterhoeven + * + * 2001 - Documented with DocBook + * - Brad Douglas + * + * 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 +#include +#include +#include +#include + +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 - 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; + + if (cmap->len != len) { + fb_dealloc_cmap(cmap); + if (!len) + return 0; + + cmap->red = kmalloc(size, flags); + if (!cmap->red) + goto fail; + cmap->green = kmalloc(size, flags); + if (!cmap->green) + goto fail; + cmap->blue = kmalloc(size, flags); + if (!cmap->blue) + goto fail; + if (transp) { + cmap->transp = kmalloc(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) +{ + 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; +} + +int fb_cmap_to_user(const struct fb_cmap *from, struct fb_cmap_user *to) +{ + 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) +{ + 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; + if (!lock_fb_info(info)) { + rc = -ENODEV; + goto out; + } + + 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);