fbcmap.c 8.1 KB

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  1. /*
  2. * linux/drivers/video/fbcmap.c -- Colormap handling for frame buffer devices
  3. *
  4. * Created 15 Jun 1997 by Geert Uytterhoeven
  5. *
  6. * 2001 - Documented with DocBook
  7. * - Brad Douglas <brad@neruo.com>
  8. *
  9. * This file is subject to the terms and conditions of the GNU General Public
  10. * License. See the file COPYING in the main directory of this archive for
  11. * more details.
  12. */
  13. #include <linux/string.h>
  14. #include <linux/module.h>
  15. #include <linux/fb.h>
  16. #include <linux/slab.h>
  17. #include <asm/uaccess.h>
  18. static u16 red2[] __read_mostly = {
  19. 0x0000, 0xaaaa
  20. };
  21. static u16 green2[] __read_mostly = {
  22. 0x0000, 0xaaaa
  23. };
  24. static u16 blue2[] __read_mostly = {
  25. 0x0000, 0xaaaa
  26. };
  27. static u16 red4[] __read_mostly = {
  28. 0x0000, 0xaaaa, 0x5555, 0xffff
  29. };
  30. static u16 green4[] __read_mostly = {
  31. 0x0000, 0xaaaa, 0x5555, 0xffff
  32. };
  33. static u16 blue4[] __read_mostly = {
  34. 0x0000, 0xaaaa, 0x5555, 0xffff
  35. };
  36. static u16 red8[] __read_mostly = {
  37. 0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa
  38. };
  39. static u16 green8[] __read_mostly = {
  40. 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa
  41. };
  42. static u16 blue8[] __read_mostly = {
  43. 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa
  44. };
  45. static u16 red16[] __read_mostly = {
  46. 0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa,
  47. 0x5555, 0x5555, 0x5555, 0x5555, 0xffff, 0xffff, 0xffff, 0xffff
  48. };
  49. static u16 green16[] __read_mostly = {
  50. 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa,
  51. 0x5555, 0x5555, 0xffff, 0xffff, 0x5555, 0x5555, 0xffff, 0xffff
  52. };
  53. static u16 blue16[] __read_mostly = {
  54. 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa,
  55. 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff
  56. };
  57. static const struct fb_cmap default_2_colors = {
  58. .len=2, .red=red2, .green=green2, .blue=blue2
  59. };
  60. static const struct fb_cmap default_8_colors = {
  61. .len=8, .red=red8, .green=green8, .blue=blue8
  62. };
  63. static const struct fb_cmap default_4_colors = {
  64. .len=4, .red=red4, .green=green4, .blue=blue4
  65. };
  66. static const struct fb_cmap default_16_colors = {
  67. .len=16, .red=red16, .green=green16, .blue=blue16
  68. };
  69. /**
  70. * fb_alloc_cmap - allocate a colormap
  71. * @cmap: frame buffer colormap structure
  72. * @len: length of @cmap
  73. * @transp: boolean, 1 if there is transparency, 0 otherwise
  74. *
  75. * Allocates memory for a colormap @cmap. @len is the
  76. * number of entries in the palette.
  77. *
  78. * Returns negative errno on error, or zero on success.
  79. *
  80. */
  81. int fb_alloc_cmap(struct fb_cmap *cmap, int len, int transp)
  82. {
  83. int size = len*sizeof(u16);
  84. if (cmap->len != len) {
  85. fb_dealloc_cmap(cmap);
  86. if (!len)
  87. return 0;
  88. if (!(cmap->red = kmalloc(size, GFP_ATOMIC)))
  89. goto fail;
  90. if (!(cmap->green = kmalloc(size, GFP_ATOMIC)))
  91. goto fail;
  92. if (!(cmap->blue = kmalloc(size, GFP_ATOMIC)))
  93. goto fail;
  94. if (transp) {
  95. if (!(cmap->transp = kmalloc(size, GFP_ATOMIC)))
  96. goto fail;
  97. } else
  98. cmap->transp = NULL;
  99. }
  100. cmap->start = 0;
  101. cmap->len = len;
  102. fb_copy_cmap(fb_default_cmap(len), cmap);
  103. return 0;
  104. fail:
  105. fb_dealloc_cmap(cmap);
  106. return -ENOMEM;
  107. }
  108. /**
  109. * fb_dealloc_cmap - deallocate a colormap
  110. * @cmap: frame buffer colormap structure
  111. *
  112. * Deallocates a colormap that was previously allocated with
  113. * fb_alloc_cmap().
  114. *
  115. */
  116. void fb_dealloc_cmap(struct fb_cmap *cmap)
  117. {
  118. kfree(cmap->red);
  119. kfree(cmap->green);
  120. kfree(cmap->blue);
  121. kfree(cmap->transp);
  122. cmap->red = cmap->green = cmap->blue = cmap->transp = NULL;
  123. cmap->len = 0;
  124. }
  125. /**
  126. * fb_copy_cmap - copy a colormap
  127. * @from: frame buffer colormap structure
  128. * @to: frame buffer colormap structure
  129. *
  130. * Copy contents of colormap from @from to @to.
  131. */
  132. int fb_copy_cmap(const struct fb_cmap *from, struct fb_cmap *to)
  133. {
  134. int tooff = 0, fromoff = 0;
  135. int size;
  136. if (to->start > from->start)
  137. fromoff = to->start - from->start;
  138. else
  139. tooff = from->start - to->start;
  140. size = to->len - tooff;
  141. if (size > (int) (from->len - fromoff))
  142. size = from->len - fromoff;
  143. if (size <= 0)
  144. return -EINVAL;
  145. size *= sizeof(u16);
  146. memcpy(to->red+tooff, from->red+fromoff, size);
  147. memcpy(to->green+tooff, from->green+fromoff, size);
  148. memcpy(to->blue+tooff, from->blue+fromoff, size);
  149. if (from->transp && to->transp)
  150. memcpy(to->transp+tooff, from->transp+fromoff, size);
  151. return 0;
  152. }
  153. int fb_cmap_to_user(const struct fb_cmap *from, struct fb_cmap_user *to)
  154. {
  155. int tooff = 0, fromoff = 0;
  156. int size;
  157. if (to->start > from->start)
  158. fromoff = to->start - from->start;
  159. else
  160. tooff = from->start - to->start;
  161. size = to->len - tooff;
  162. if (size > (int) (from->len - fromoff))
  163. size = from->len - fromoff;
  164. if (size <= 0)
  165. return -EINVAL;
  166. size *= sizeof(u16);
  167. if (copy_to_user(to->red+tooff, from->red+fromoff, size))
  168. return -EFAULT;
  169. if (copy_to_user(to->green+tooff, from->green+fromoff, size))
  170. return -EFAULT;
  171. if (copy_to_user(to->blue+tooff, from->blue+fromoff, size))
  172. return -EFAULT;
  173. if (from->transp && to->transp)
  174. if (copy_to_user(to->transp+tooff, from->transp+fromoff, size))
  175. return -EFAULT;
  176. return 0;
  177. }
  178. /**
  179. * fb_set_cmap - set the colormap
  180. * @cmap: frame buffer colormap structure
  181. * @info: frame buffer info structure
  182. *
  183. * Sets the colormap @cmap for a screen of device @info.
  184. *
  185. * Returns negative errno on error, or zero on success.
  186. *
  187. */
  188. int fb_set_cmap(struct fb_cmap *cmap, struct fb_info *info)
  189. {
  190. int i, start, rc = 0;
  191. u16 *red, *green, *blue, *transp;
  192. u_int hred, hgreen, hblue, htransp = 0xffff;
  193. red = cmap->red;
  194. green = cmap->green;
  195. blue = cmap->blue;
  196. transp = cmap->transp;
  197. start = cmap->start;
  198. if (start < 0 || (!info->fbops->fb_setcolreg &&
  199. !info->fbops->fb_setcmap))
  200. return -EINVAL;
  201. if (info->fbops->fb_setcmap) {
  202. rc = info->fbops->fb_setcmap(cmap, info);
  203. } else {
  204. for (i = 0; i < cmap->len; i++) {
  205. hred = *red++;
  206. hgreen = *green++;
  207. hblue = *blue++;
  208. if (transp)
  209. htransp = *transp++;
  210. if (info->fbops->fb_setcolreg(start++,
  211. hred, hgreen, hblue,
  212. htransp, info))
  213. break;
  214. }
  215. }
  216. if (rc == 0)
  217. fb_copy_cmap(cmap, &info->cmap);
  218. return rc;
  219. }
  220. int fb_set_user_cmap(struct fb_cmap_user *cmap, struct fb_info *info)
  221. {
  222. int rc, size = cmap->len * sizeof(u16);
  223. struct fb_cmap umap;
  224. if (cmap->start < 0 || (!info->fbops->fb_setcolreg &&
  225. !info->fbops->fb_setcmap))
  226. return -EINVAL;
  227. memset(&umap, 0, sizeof(struct fb_cmap));
  228. rc = fb_alloc_cmap(&umap, cmap->len, cmap->transp != NULL);
  229. if (rc)
  230. return rc;
  231. if (copy_from_user(umap.red, cmap->red, size) ||
  232. copy_from_user(umap.green, cmap->green, size) ||
  233. copy_from_user(umap.blue, cmap->blue, size) ||
  234. (cmap->transp && copy_from_user(umap.transp, cmap->transp, size))) {
  235. fb_dealloc_cmap(&umap);
  236. return -EFAULT;
  237. }
  238. umap.start = cmap->start;
  239. rc = fb_set_cmap(&umap, info);
  240. fb_dealloc_cmap(&umap);
  241. return rc;
  242. }
  243. /**
  244. * fb_default_cmap - get default colormap
  245. * @len: size of palette for a depth
  246. *
  247. * Gets the default colormap for a specific screen depth. @len
  248. * is the size of the palette for a particular screen depth.
  249. *
  250. * Returns pointer to a frame buffer colormap structure.
  251. *
  252. */
  253. const struct fb_cmap *fb_default_cmap(int len)
  254. {
  255. if (len <= 2)
  256. return &default_2_colors;
  257. if (len <= 4)
  258. return &default_4_colors;
  259. if (len <= 8)
  260. return &default_8_colors;
  261. return &default_16_colors;
  262. }
  263. /**
  264. * fb_invert_cmaps - invert all defaults colormaps
  265. *
  266. * Invert all default colormaps.
  267. *
  268. */
  269. void fb_invert_cmaps(void)
  270. {
  271. u_int i;
  272. for (i = 0; i < ARRAY_SIZE(red2); i++) {
  273. red2[i] = ~red2[i];
  274. green2[i] = ~green2[i];
  275. blue2[i] = ~blue2[i];
  276. }
  277. for (i = 0; i < ARRAY_SIZE(red4); i++) {
  278. red4[i] = ~red4[i];
  279. green4[i] = ~green4[i];
  280. blue4[i] = ~blue4[i];
  281. }
  282. for (i = 0; i < ARRAY_SIZE(red8); i++) {
  283. red8[i] = ~red8[i];
  284. green8[i] = ~green8[i];
  285. blue8[i] = ~blue8[i];
  286. }
  287. for (i = 0; i < ARRAY_SIZE(red16); i++) {
  288. red16[i] = ~red16[i];
  289. green16[i] = ~green16[i];
  290. blue16[i] = ~blue16[i];
  291. }
  292. }
  293. /*
  294. * Visible symbols for modules
  295. */
  296. EXPORT_SYMBOL(fb_alloc_cmap);
  297. EXPORT_SYMBOL(fb_dealloc_cmap);
  298. EXPORT_SYMBOL(fb_copy_cmap);
  299. EXPORT_SYMBOL(fb_set_cmap);
  300. EXPORT_SYMBOL(fb_default_cmap);
  301. EXPORT_SYMBOL(fb_invert_cmaps);