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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/fb.h>
17#include <linux/slab.h>
Krzysztof Helt84902b72007-10-16 01:29:04 -070018#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
Helge Delleradf6b202006-12-08 02:40:27 -080020static u16 red2[] __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 0x0000, 0xaaaa
22};
Helge Delleradf6b202006-12-08 02:40:27 -080023static u16 green2[] __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 0x0000, 0xaaaa
25};
Helge Delleradf6b202006-12-08 02:40:27 -080026static u16 blue2[] __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070027 0x0000, 0xaaaa
28};
29
Helge Delleradf6b202006-12-08 02:40:27 -080030static u16 red4[] __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 0x0000, 0xaaaa, 0x5555, 0xffff
32};
Helge Delleradf6b202006-12-08 02:40:27 -080033static u16 green4[] __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 0x0000, 0xaaaa, 0x5555, 0xffff
35};
Helge Delleradf6b202006-12-08 02:40:27 -080036static u16 blue4[] __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 0x0000, 0xaaaa, 0x5555, 0xffff
38};
39
Helge Delleradf6b202006-12-08 02:40:27 -080040static u16 red8[] __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa
42};
Helge Delleradf6b202006-12-08 02:40:27 -080043static u16 green8[] __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa
45};
Helge Delleradf6b202006-12-08 02:40:27 -080046static u16 blue8[] __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa
48};
49
Helge Delleradf6b202006-12-08 02:40:27 -080050static u16 red16[] __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa,
52 0x5555, 0x5555, 0x5555, 0x5555, 0xffff, 0xffff, 0xffff, 0xffff
53};
Helge Delleradf6b202006-12-08 02:40:27 -080054static u16 green16[] __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa,
56 0x5555, 0x5555, 0xffff, 0xffff, 0x5555, 0x5555, 0xffff, 0xffff
57};
Helge Delleradf6b202006-12-08 02:40:27 -080058static u16 blue16[] __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa,
60 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff
61};
62
Helge Delleradf6b202006-12-08 02:40:27 -080063static const struct fb_cmap default_2_colors = {
64 .len=2, .red=red2, .green=green2, .blue=blue2
Linus Torvalds1da177e2005-04-16 15:20:36 -070065};
Helge Delleradf6b202006-12-08 02:40:27 -080066static const struct fb_cmap default_8_colors = {
67 .len=8, .red=red8, .green=green8, .blue=blue8
Linus Torvalds1da177e2005-04-16 15:20:36 -070068};
Helge Delleradf6b202006-12-08 02:40:27 -080069static const struct fb_cmap default_4_colors = {
70 .len=4, .red=red4, .green=green4, .blue=blue4
Linus Torvalds1da177e2005-04-16 15:20:36 -070071};
Helge Delleradf6b202006-12-08 02:40:27 -080072static const struct fb_cmap default_16_colors = {
73 .len=16, .red=red16, .green=green16, .blue=blue16
Linus Torvalds1da177e2005-04-16 15:20:36 -070074};
75
76
Helge Delleradf6b202006-12-08 02:40:27 -080077
Linus Torvalds1da177e2005-04-16 15:20:36 -070078/**
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 *
84 * Allocates memory for a colormap @cmap. @len is the
85 * number of entries in the palette.
86 *
Alan Currydb77ec22006-03-27 01:17:30 -080087 * Returns negative errno on error, or zero on success.
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 *
89 */
90
91int fb_alloc_cmap(struct fb_cmap *cmap, int len, int transp)
92{
Dan Carpenterc3531032010-11-13 13:06:38 +030093 int size = len * sizeof(u16);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
Dan Carpenterc3531032010-11-13 13:06:38 +030095 if (cmap->len != len) {
96 fb_dealloc_cmap(cmap);
97 if (!len)
98 return 0;
99
100 cmap->red = kmalloc(size, GFP_ATOMIC);
101 if (!cmap->red)
102 goto fail;
103 cmap->green = kmalloc(size, GFP_ATOMIC);
104 if (!cmap->green)
105 goto fail;
106 cmap->blue = kmalloc(size, GFP_ATOMIC);
107 if (!cmap->blue)
108 goto fail;
109 if (transp) {
110 cmap->transp = kmalloc(size, GFP_ATOMIC);
111 if (!cmap->transp)
112 goto fail;
113 } else {
114 cmap->transp = NULL;
115 }
116 }
117 cmap->start = 0;
118 cmap->len = len;
119 fb_copy_cmap(fb_default_cmap(len), cmap);
120 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
122fail:
Dan Carpenterc3531032010-11-13 13:06:38 +0300123 fb_dealloc_cmap(cmap);
124 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125}
126
127/**
128 * fb_dealloc_cmap - deallocate a colormap
129 * @cmap: frame buffer colormap structure
130 *
131 * Deallocates a colormap that was previously allocated with
132 * fb_alloc_cmap().
133 *
134 */
135
136void fb_dealloc_cmap(struct fb_cmap *cmap)
137{
138 kfree(cmap->red);
139 kfree(cmap->green);
140 kfree(cmap->blue);
141 kfree(cmap->transp);
142
143 cmap->red = cmap->green = cmap->blue = cmap->transp = NULL;
144 cmap->len = 0;
145}
146
147/**
148 * fb_copy_cmap - copy a colormap
149 * @from: frame buffer colormap structure
150 * @to: frame buffer colormap structure
151 *
152 * Copy contents of colormap from @from to @to.
153 */
154
Helge Delleradf6b202006-12-08 02:40:27 -0800155int fb_copy_cmap(const struct fb_cmap *from, struct fb_cmap *to)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156{
157 int tooff = 0, fromoff = 0;
158 int size;
159
160 if (to->start > from->start)
161 fromoff = to->start - from->start;
162 else
163 tooff = from->start - to->start;
164 size = to->len - tooff;
165 if (size > (int) (from->len - fromoff))
166 size = from->len - fromoff;
167 if (size <= 0)
168 return -EINVAL;
169 size *= sizeof(u16);
170
171 memcpy(to->red+tooff, from->red+fromoff, size);
172 memcpy(to->green+tooff, from->green+fromoff, size);
173 memcpy(to->blue+tooff, from->blue+fromoff, size);
174 if (from->transp && to->transp)
175 memcpy(to->transp+tooff, from->transp+fromoff, size);
176 return 0;
177}
178
Helge Delleradf6b202006-12-08 02:40:27 -0800179int fb_cmap_to_user(const struct fb_cmap *from, struct fb_cmap_user *to)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180{
181 int tooff = 0, fromoff = 0;
182 int size;
183
184 if (to->start > from->start)
185 fromoff = to->start - from->start;
186 else
187 tooff = from->start - to->start;
188 size = to->len - tooff;
189 if (size > (int) (from->len - fromoff))
190 size = from->len - fromoff;
191 if (size <= 0)
192 return -EINVAL;
193 size *= sizeof(u16);
194
195 if (copy_to_user(to->red+tooff, from->red+fromoff, size))
196 return -EFAULT;
197 if (copy_to_user(to->green+tooff, from->green+fromoff, size))
198 return -EFAULT;
199 if (copy_to_user(to->blue+tooff, from->blue+fromoff, size))
200 return -EFAULT;
201 if (from->transp && to->transp)
202 if (copy_to_user(to->transp+tooff, from->transp+fromoff, size))
203 return -EFAULT;
204 return 0;
205}
206
207/**
208 * fb_set_cmap - set the colormap
209 * @cmap: frame buffer colormap structure
210 * @info: frame buffer info structure
211 *
212 * Sets the colormap @cmap for a screen of device @info.
213 *
214 * Returns negative errno on error, or zero on success.
215 *
216 */
217
218int fb_set_cmap(struct fb_cmap *cmap, struct fb_info *info)
219{
Michal Januszewski03e259a2005-07-27 11:46:08 -0700220 int i, start, rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 u16 *red, *green, *blue, *transp;
222 u_int hred, hgreen, hblue, htransp = 0xffff;
223
224 red = cmap->red;
225 green = cmap->green;
226 blue = cmap->blue;
227 transp = cmap->transp;
228 start = cmap->start;
229
Benjamin Herrenschmidt71494372005-05-01 08:59:22 -0700230 if (start < 0 || (!info->fbops->fb_setcolreg &&
231 !info->fbops->fb_setcmap))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 return -EINVAL;
Michal Januszewski03e259a2005-07-27 11:46:08 -0700233 if (info->fbops->fb_setcmap) {
234 rc = info->fbops->fb_setcmap(cmap, info);
235 } else {
236 for (i = 0; i < cmap->len; i++) {
237 hred = *red++;
238 hgreen = *green++;
239 hblue = *blue++;
240 if (transp)
241 htransp = *transp++;
242 if (info->fbops->fb_setcolreg(start++,
243 hred, hgreen, hblue,
244 htransp, info))
245 break;
246 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 }
Michal Januszewski03e259a2005-07-27 11:46:08 -0700248 if (rc == 0)
249 fb_copy_cmap(cmap, &info->cmap);
250
251 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252}
253
254int fb_set_user_cmap(struct fb_cmap_user *cmap, struct fb_info *info)
255{
Michal Januszewski03e259a2005-07-27 11:46:08 -0700256 int rc, size = cmap->len * sizeof(u16);
257 struct fb_cmap umap;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
Michal Januszewski03e259a2005-07-27 11:46:08 -0700259 memset(&umap, 0, sizeof(struct fb_cmap));
260 rc = fb_alloc_cmap(&umap, cmap->len, cmap->transp != NULL);
261 if (rc)
Benjamin Herrenschmidt71494372005-05-01 08:59:22 -0700262 return rc;
Michal Januszewski03e259a2005-07-27 11:46:08 -0700263 if (copy_from_user(umap.red, cmap->red, size) ||
264 copy_from_user(umap.green, cmap->green, size) ||
265 copy_from_user(umap.blue, cmap->blue, size) ||
266 (cmap->transp && copy_from_user(umap.transp, cmap->transp, size))) {
Andrea Righi1f5e31d2009-02-04 15:12:03 -0800267 rc = -EFAULT;
268 goto out;
Benjamin Herrenschmidt71494372005-05-01 08:59:22 -0700269 }
Michal Januszewski03e259a2005-07-27 11:46:08 -0700270 umap.start = cmap->start;
Andrea Righi1f5e31d2009-02-04 15:12:03 -0800271 if (!lock_fb_info(info)) {
272 rc = -ENODEV;
273 goto out;
274 }
275 if (cmap->start < 0 || (!info->fbops->fb_setcolreg &&
276 !info->fbops->fb_setcmap)) {
277 rc = -EINVAL;
278 goto out1;
279 }
Michal Januszewski03e259a2005-07-27 11:46:08 -0700280 rc = fb_set_cmap(&umap, info);
Andrea Righi1f5e31d2009-02-04 15:12:03 -0800281out1:
282 unlock_fb_info(info);
283out:
Michal Januszewski03e259a2005-07-27 11:46:08 -0700284 fb_dealloc_cmap(&umap);
285 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286}
287
288/**
289 * fb_default_cmap - get default colormap
290 * @len: size of palette for a depth
291 *
292 * Gets the default colormap for a specific screen depth. @len
293 * is the size of the palette for a particular screen depth.
294 *
295 * Returns pointer to a frame buffer colormap structure.
296 *
297 */
298
Helge Delleradf6b202006-12-08 02:40:27 -0800299const struct fb_cmap *fb_default_cmap(int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300{
301 if (len <= 2)
302 return &default_2_colors;
303 if (len <= 4)
304 return &default_4_colors;
305 if (len <= 8)
306 return &default_8_colors;
307 return &default_16_colors;
308}
309
310
311/**
312 * fb_invert_cmaps - invert all defaults colormaps
313 *
314 * Invert all default colormaps.
315 *
316 */
317
318void fb_invert_cmaps(void)
319{
320 u_int i;
321
Helge Delleradf6b202006-12-08 02:40:27 -0800322 for (i = 0; i < ARRAY_SIZE(red2); i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 red2[i] = ~red2[i];
324 green2[i] = ~green2[i];
325 blue2[i] = ~blue2[i];
326 }
Helge Delleradf6b202006-12-08 02:40:27 -0800327 for (i = 0; i < ARRAY_SIZE(red4); i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 red4[i] = ~red4[i];
329 green4[i] = ~green4[i];
330 blue4[i] = ~blue4[i];
331 }
Helge Delleradf6b202006-12-08 02:40:27 -0800332 for (i = 0; i < ARRAY_SIZE(red8); i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 red8[i] = ~red8[i];
334 green8[i] = ~green8[i];
335 blue8[i] = ~blue8[i];
336 }
Helge Delleradf6b202006-12-08 02:40:27 -0800337 for (i = 0; i < ARRAY_SIZE(red16); i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 red16[i] = ~red16[i];
339 green16[i] = ~green16[i];
340 blue16[i] = ~blue16[i];
341 }
342}
343
344
345 /*
346 * Visible symbols for modules
347 */
348
349EXPORT_SYMBOL(fb_alloc_cmap);
350EXPORT_SYMBOL(fb_dealloc_cmap);
351EXPORT_SYMBOL(fb_copy_cmap);
352EXPORT_SYMBOL(fb_set_cmap);
353EXPORT_SYMBOL(fb_default_cmap);
354EXPORT_SYMBOL(fb_invert_cmaps);