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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
14#include <linux/string.h>
15#include <linux/module.h>
16#include <linux/fb.h>
17#include <linux/slab.h>
18#include <linux/uaccess.h>
19
20static u16 red2[] __read_mostly = {
21 0x0000, 0xaaaa
22};
23static u16 green2[] __read_mostly = {
24 0x0000, 0xaaaa
25};
26static u16 blue2[] __read_mostly = {
27 0x0000, 0xaaaa
28};
29
30static u16 red4[] __read_mostly = {
31 0x0000, 0xaaaa, 0x5555, 0xffff
32};
33static u16 green4[] __read_mostly = {
34 0x0000, 0xaaaa, 0x5555, 0xffff
35};
36static u16 blue4[] __read_mostly = {
37 0x0000, 0xaaaa, 0x5555, 0xffff
38};
39
40static u16 red8[] __read_mostly = {
41 0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa
42};
43static u16 green8[] __read_mostly = {
44 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa
45};
46static u16 blue8[] __read_mostly = {
47 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa
48};
49
50static u16 red16[] __read_mostly = {
51 0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa,
52 0x5555, 0x5555, 0x5555, 0x5555, 0xffff, 0xffff, 0xffff, 0xffff
53};
54static u16 green16[] __read_mostly = {
55 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa,
56 0x5555, 0x5555, 0xffff, 0xffff, 0x5555, 0x5555, 0xffff, 0xffff
57};
58static u16 blue16[] __read_mostly = {
59 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa,
60 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff
61};
62
63static const struct fb_cmap default_2_colors = {
64 .len=2, .red=red2, .green=green2, .blue=blue2
65};
66static const struct fb_cmap default_8_colors = {
67 .len=8, .red=red8, .green=green8, .blue=blue8
68};
69static const struct fb_cmap default_4_colors = {
70 .len=4, .red=red4, .green=green4, .blue=blue4
71};
72static const struct fb_cmap default_16_colors = {
73 .len=16, .red=red16, .green=green16, .blue=blue16
74};
75
76
77
78/**
79 * fb_alloc_cmap - allocate a colormap
80 * @cmap: frame buffer colormap structure
81 * @len: length of @cmap
82 * @transp: boolean, 1 if there is transparency, 0 otherwise
83 * @flags: flags for kmalloc memory allocation
84 *
85 * Allocates memory for a colormap @cmap. @len is the
86 * number of entries in the palette.
87 *
88 * Returns negative errno on error, or zero on success.
89 *
90 */
91
92int fb_alloc_cmap_gfp(struct fb_cmap *cmap, int len, int transp, gfp_t flags)
93{
94 int size = len * sizeof(u16);
95 int ret = -ENOMEM;
96
97 if (cmap->len != len) {
98 fb_dealloc_cmap(cmap);
99 if (!len)
100 return 0;
101
102 cmap->red = kmalloc(size, flags);
103 if (!cmap->red)
104 goto fail;
105 cmap->green = kmalloc(size, flags);
106 if (!cmap->green)
107 goto fail;
108 cmap->blue = kmalloc(size, flags);
109 if (!cmap->blue)
110 goto fail;
111 if (transp) {
112 cmap->transp = kmalloc(size, flags);
113 if (!cmap->transp)
114 goto fail;
115 } else {
116 cmap->transp = NULL;
117 }
118 }
119 cmap->start = 0;
120 cmap->len = len;
121 ret = fb_copy_cmap(fb_default_cmap(len), cmap);
122 if (ret)
123 goto fail;
124 return 0;
125
126fail:
127 fb_dealloc_cmap(cmap);
128 return ret;
129}
130
131int fb_alloc_cmap(struct fb_cmap *cmap, int len, int transp)
132{
133 return fb_alloc_cmap_gfp(cmap, len, transp, GFP_ATOMIC);
134}
135
136/**
137 * fb_dealloc_cmap - deallocate a colormap
138 * @cmap: frame buffer colormap structure
139 *
140 * Deallocates a colormap that was previously allocated with
141 * fb_alloc_cmap().
142 *
143 */
144
145void fb_dealloc_cmap(struct fb_cmap *cmap)
146{
147 kfree(cmap->red);
148 kfree(cmap->green);
149 kfree(cmap->blue);
150 kfree(cmap->transp);
151
152 cmap->red = cmap->green = cmap->blue = cmap->transp = NULL;
153 cmap->len = 0;
154}
155
156/**
157 * fb_copy_cmap - copy a colormap
158 * @from: frame buffer colormap structure
159 * @to: frame buffer colormap structure
160 *
161 * Copy contents of colormap from @from to @to.
162 */
163
164int fb_copy_cmap(const struct fb_cmap *from, struct fb_cmap *to)
165{
166 int tooff = 0, fromoff = 0;
167 int size;
168
169 if (to->start > from->start)
170 fromoff = to->start - from->start;
171 else
172 tooff = from->start - to->start;
173 size = to->len - tooff;
174 if (size > (int) (from->len - fromoff))
175 size = from->len - fromoff;
176 if (size <= 0)
177 return -EINVAL;
178 size *= sizeof(u16);
179
180 memcpy(to->red+tooff, from->red+fromoff, size);
181 memcpy(to->green+tooff, from->green+fromoff, size);
182 memcpy(to->blue+tooff, from->blue+fromoff, size);
183 if (from->transp && to->transp)
184 memcpy(to->transp+tooff, from->transp+fromoff, size);
185 return 0;
186}
187
188int fb_cmap_to_user(const struct fb_cmap *from, struct fb_cmap_user *to)
189{
190 int tooff = 0, fromoff = 0;
191 int size;
192
193 if (to->start > from->start)
194 fromoff = to->start - from->start;
195 else
196 tooff = from->start - to->start;
197 size = to->len - tooff;
198 if (size > (int) (from->len - fromoff))
199 size = from->len - fromoff;
200 if (size <= 0)
201 return -EINVAL;
202 size *= sizeof(u16);
203
204 if (copy_to_user(to->red+tooff, from->red+fromoff, size))
205 return -EFAULT;
206 if (copy_to_user(to->green+tooff, from->green+fromoff, size))
207 return -EFAULT;
208 if (copy_to_user(to->blue+tooff, from->blue+fromoff, size))
209 return -EFAULT;
210 if (from->transp && to->transp)
211 if (copy_to_user(to->transp+tooff, from->transp+fromoff, size))
212 return -EFAULT;
213 return 0;
214}
215
216/**
217 * fb_set_cmap - set the colormap
218 * @cmap: frame buffer colormap structure
219 * @info: frame buffer info structure
220 *
221 * Sets the colormap @cmap for a screen of device @info.
222 *
223 * Returns negative errno on error, or zero on success.
224 *
225 */
226
227int fb_set_cmap(struct fb_cmap *cmap, struct fb_info *info)
228{
229 int i, start, rc = 0;
230 u16 *red, *green, *blue, *transp;
231 u_int hred, hgreen, hblue, htransp = 0xffff;
232
233 red = cmap->red;
234 green = cmap->green;
235 blue = cmap->blue;
236 transp = cmap->transp;
237 start = cmap->start;
238
239 if (start < 0 || (!info->fbops->fb_setcolreg &&
240 !info->fbops->fb_setcmap))
241 return -EINVAL;
242 if (info->fbops->fb_setcmap) {
243 rc = info->fbops->fb_setcmap(cmap, info);
244 } else {
245 for (i = 0; i < cmap->len; i++) {
246 hred = *red++;
247 hgreen = *green++;
248 hblue = *blue++;
249 if (transp)
250 htransp = *transp++;
251 if (info->fbops->fb_setcolreg(start++,
252 hred, hgreen, hblue,
253 htransp, info))
254 break;
255 }
256 }
257 if (rc == 0)
258 fb_copy_cmap(cmap, &info->cmap);
259
260 return rc;
261}
262
263int fb_set_user_cmap(struct fb_cmap_user *cmap, struct fb_info *info)
264{
265 int rc, size = cmap->len * sizeof(u16);
266 struct fb_cmap umap;
267
268 if (size < 0 || size < cmap->len)
269 return -E2BIG;
270
271 memset(&umap, 0, sizeof(struct fb_cmap));
272 rc = fb_alloc_cmap_gfp(&umap, cmap->len, cmap->transp != NULL,
273 GFP_KERNEL);
274 if (rc)
275 return rc;
276 if (copy_from_user(umap.red, cmap->red, size) ||
277 copy_from_user(umap.green, cmap->green, size) ||
278 copy_from_user(umap.blue, cmap->blue, size) ||
279 (cmap->transp && copy_from_user(umap.transp, cmap->transp, size))) {
280 rc = -EFAULT;
281 goto out;
282 }
283 umap.start = cmap->start;
284 if (!lock_fb_info(info)) {
285 rc = -ENODEV;
286 goto out;
287 }
288 if (cmap->start < 0 || (!info->fbops->fb_setcolreg &&
289 !info->fbops->fb_setcmap)) {
290 rc = -EINVAL;
291 goto out1;
292 }
293 rc = fb_set_cmap(&umap, info);
294out1:
295 unlock_fb_info(info);
296out:
297 fb_dealloc_cmap(&umap);
298 return rc;
299}
300
301/**
302 * fb_default_cmap - get default colormap
303 * @len: size of palette for a depth
304 *
305 * Gets the default colormap for a specific screen depth. @len
306 * is the size of the palette for a particular screen depth.
307 *
308 * Returns pointer to a frame buffer colormap structure.
309 *
310 */
311
312const struct fb_cmap *fb_default_cmap(int len)
313{
314 if (len <= 2)
315 return &default_2_colors;
316 if (len <= 4)
317 return &default_4_colors;
318 if (len <= 8)
319 return &default_8_colors;
320 return &default_16_colors;
321}
322
323
324/**
325 * fb_invert_cmaps - invert all defaults colormaps
326 *
327 * Invert all default colormaps.
328 *
329 */
330
331void fb_invert_cmaps(void)
332{
333 u_int i;
334
335 for (i = 0; i < ARRAY_SIZE(red2); i++) {
336 red2[i] = ~red2[i];
337 green2[i] = ~green2[i];
338 blue2[i] = ~blue2[i];
339 }
340 for (i = 0; i < ARRAY_SIZE(red4); i++) {
341 red4[i] = ~red4[i];
342 green4[i] = ~green4[i];
343 blue4[i] = ~blue4[i];
344 }
345 for (i = 0; i < ARRAY_SIZE(red8); i++) {
346 red8[i] = ~red8[i];
347 green8[i] = ~green8[i];
348 blue8[i] = ~blue8[i];
349 }
350 for (i = 0; i < ARRAY_SIZE(red16); i++) {
351 red16[i] = ~red16[i];
352 green16[i] = ~green16[i];
353 blue16[i] = ~blue16[i];
354 }
355}
356
357
358 /*
359 * Visible symbols for modules
360 */
361
362EXPORT_SYMBOL(fb_alloc_cmap);
363EXPORT_SYMBOL(fb_dealloc_cmap);
364EXPORT_SYMBOL(fb_copy_cmap);
365EXPORT_SYMBOL(fb_set_cmap);
366EXPORT_SYMBOL(fb_default_cmap);
367EXPORT_SYMBOL(fb_invert_cmaps);