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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>
18
19#include <asm/uaccess.h>
20
21static u16 red2[] = {
22 0x0000, 0xaaaa
23};
24static u16 green2[] = {
25 0x0000, 0xaaaa
26};
27static u16 blue2[] = {
28 0x0000, 0xaaaa
29};
30
31static u16 red4[] = {
32 0x0000, 0xaaaa, 0x5555, 0xffff
33};
34static u16 green4[] = {
35 0x0000, 0xaaaa, 0x5555, 0xffff
36};
37static u16 blue4[] = {
38 0x0000, 0xaaaa, 0x5555, 0xffff
39};
40
41static u16 red8[] = {
42 0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa
43};
44static u16 green8[] = {
45 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa
46};
47static u16 blue8[] = {
48 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa
49};
50
51static u16 red16[] = {
52 0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa,
53 0x5555, 0x5555, 0x5555, 0x5555, 0xffff, 0xffff, 0xffff, 0xffff
54};
55static u16 green16[] = {
56 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa,
57 0x5555, 0x5555, 0xffff, 0xffff, 0x5555, 0x5555, 0xffff, 0xffff
58};
59static u16 blue16[] = {
60 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa,
61 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff
62};
63
64static struct fb_cmap default_2_colors = {
65 0, 2, red2, green2, blue2, NULL
66};
67static struct fb_cmap default_8_colors = {
68 0, 8, red8, green8, blue8, NULL
69};
70static struct fb_cmap default_4_colors = {
71 0, 4, red4, green4, blue4, NULL
72};
73static struct fb_cmap default_16_colors = {
74 0, 16, red16, green16, blue16, NULL
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 *
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{
93 int size = len*sizeof(u16);
94
95 if (cmap->len != len) {
96 fb_dealloc_cmap(cmap);
97 if (!len)
98 return 0;
99 if (!(cmap->red = kmalloc(size, GFP_ATOMIC)))
100 goto fail;
101 if (!(cmap->green = kmalloc(size, GFP_ATOMIC)))
102 goto fail;
103 if (!(cmap->blue = kmalloc(size, GFP_ATOMIC)))
104 goto fail;
105 if (transp) {
106 if (!(cmap->transp = kmalloc(size, GFP_ATOMIC)))
107 goto fail;
108 } else
109 cmap->transp = NULL;
110 }
111 cmap->start = 0;
112 cmap->len = len;
113 fb_copy_cmap(fb_default_cmap(len), cmap);
114 return 0;
115
116fail:
117 fb_dealloc_cmap(cmap);
Alan Currydb77ec22006-03-27 01:17:30 -0800118 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119}
120
121/**
122 * fb_dealloc_cmap - deallocate a colormap
123 * @cmap: frame buffer colormap structure
124 *
125 * Deallocates a colormap that was previously allocated with
126 * fb_alloc_cmap().
127 *
128 */
129
130void fb_dealloc_cmap(struct fb_cmap *cmap)
131{
132 kfree(cmap->red);
133 kfree(cmap->green);
134 kfree(cmap->blue);
135 kfree(cmap->transp);
136
137 cmap->red = cmap->green = cmap->blue = cmap->transp = NULL;
138 cmap->len = 0;
139}
140
141/**
142 * fb_copy_cmap - copy a colormap
143 * @from: frame buffer colormap structure
144 * @to: frame buffer colormap structure
145 *
146 * Copy contents of colormap from @from to @to.
147 */
148
149int fb_copy_cmap(struct fb_cmap *from, struct fb_cmap *to)
150{
151 int tooff = 0, fromoff = 0;
152 int size;
153
154 if (to->start > from->start)
155 fromoff = to->start - from->start;
156 else
157 tooff = from->start - to->start;
158 size = to->len - tooff;
159 if (size > (int) (from->len - fromoff))
160 size = from->len - fromoff;
161 if (size <= 0)
162 return -EINVAL;
163 size *= sizeof(u16);
164
165 memcpy(to->red+tooff, from->red+fromoff, size);
166 memcpy(to->green+tooff, from->green+fromoff, size);
167 memcpy(to->blue+tooff, from->blue+fromoff, size);
168 if (from->transp && to->transp)
169 memcpy(to->transp+tooff, from->transp+fromoff, size);
170 return 0;
171}
172
173int fb_cmap_to_user(struct fb_cmap *from, struct fb_cmap_user *to)
174{
175 int tooff = 0, fromoff = 0;
176 int size;
177
178 if (to->start > from->start)
179 fromoff = to->start - from->start;
180 else
181 tooff = from->start - to->start;
182 size = to->len - tooff;
183 if (size > (int) (from->len - fromoff))
184 size = from->len - fromoff;
185 if (size <= 0)
186 return -EINVAL;
187 size *= sizeof(u16);
188
189 if (copy_to_user(to->red+tooff, from->red+fromoff, size))
190 return -EFAULT;
191 if (copy_to_user(to->green+tooff, from->green+fromoff, size))
192 return -EFAULT;
193 if (copy_to_user(to->blue+tooff, from->blue+fromoff, size))
194 return -EFAULT;
195 if (from->transp && to->transp)
196 if (copy_to_user(to->transp+tooff, from->transp+fromoff, size))
197 return -EFAULT;
198 return 0;
199}
200
201/**
202 * fb_set_cmap - set the colormap
203 * @cmap: frame buffer colormap structure
204 * @info: frame buffer info structure
205 *
206 * Sets the colormap @cmap for a screen of device @info.
207 *
208 * Returns negative errno on error, or zero on success.
209 *
210 */
211
212int fb_set_cmap(struct fb_cmap *cmap, struct fb_info *info)
213{
Michal Januszewski03e259a2005-07-27 11:46:08 -0700214 int i, start, rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 u16 *red, *green, *blue, *transp;
216 u_int hred, hgreen, hblue, htransp = 0xffff;
217
218 red = cmap->red;
219 green = cmap->green;
220 blue = cmap->blue;
221 transp = cmap->transp;
222 start = cmap->start;
223
Benjamin Herrenschmidt71494372005-05-01 08:59:22 -0700224 if (start < 0 || (!info->fbops->fb_setcolreg &&
225 !info->fbops->fb_setcmap))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 return -EINVAL;
Michal Januszewski03e259a2005-07-27 11:46:08 -0700227 if (info->fbops->fb_setcmap) {
228 rc = info->fbops->fb_setcmap(cmap, info);
229 } else {
230 for (i = 0; i < cmap->len; i++) {
231 hred = *red++;
232 hgreen = *green++;
233 hblue = *blue++;
234 if (transp)
235 htransp = *transp++;
236 if (info->fbops->fb_setcolreg(start++,
237 hred, hgreen, hblue,
238 htransp, info))
239 break;
240 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 }
Michal Januszewski03e259a2005-07-27 11:46:08 -0700242 if (rc == 0)
243 fb_copy_cmap(cmap, &info->cmap);
244
245 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246}
247
248int fb_set_user_cmap(struct fb_cmap_user *cmap, struct fb_info *info)
249{
Michal Januszewski03e259a2005-07-27 11:46:08 -0700250 int rc, size = cmap->len * sizeof(u16);
251 struct fb_cmap umap;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
Michal Januszewski03e259a2005-07-27 11:46:08 -0700253 if (cmap->start < 0 || (!info->fbops->fb_setcolreg &&
254 !info->fbops->fb_setcmap))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 return -EINVAL;
Benjamin Herrenschmidt71494372005-05-01 08:59:22 -0700256
Michal Januszewski03e259a2005-07-27 11:46:08 -0700257 memset(&umap, 0, sizeof(struct fb_cmap));
258 rc = fb_alloc_cmap(&umap, cmap->len, cmap->transp != NULL);
259 if (rc)
Benjamin Herrenschmidt71494372005-05-01 08:59:22 -0700260 return rc;
Michal Januszewski03e259a2005-07-27 11:46:08 -0700261 if (copy_from_user(umap.red, cmap->red, size) ||
262 copy_from_user(umap.green, cmap->green, size) ||
263 copy_from_user(umap.blue, cmap->blue, size) ||
264 (cmap->transp && copy_from_user(umap.transp, cmap->transp, size))) {
265 fb_dealloc_cmap(&umap);
266 return -EFAULT;
Benjamin Herrenschmidt71494372005-05-01 08:59:22 -0700267 }
Michal Januszewski03e259a2005-07-27 11:46:08 -0700268 umap.start = cmap->start;
269 rc = fb_set_cmap(&umap, info);
270 fb_dealloc_cmap(&umap);
271 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272}
273
274/**
275 * fb_default_cmap - get default colormap
276 * @len: size of palette for a depth
277 *
278 * Gets the default colormap for a specific screen depth. @len
279 * is the size of the palette for a particular screen depth.
280 *
281 * Returns pointer to a frame buffer colormap structure.
282 *
283 */
284
285struct fb_cmap *fb_default_cmap(int len)
286{
287 if (len <= 2)
288 return &default_2_colors;
289 if (len <= 4)
290 return &default_4_colors;
291 if (len <= 8)
292 return &default_8_colors;
293 return &default_16_colors;
294}
295
296
297/**
298 * fb_invert_cmaps - invert all defaults colormaps
299 *
300 * Invert all default colormaps.
301 *
302 */
303
304void fb_invert_cmaps(void)
305{
306 u_int i;
307
308 for (i = 0; i < 2; i++) {
309 red2[i] = ~red2[i];
310 green2[i] = ~green2[i];
311 blue2[i] = ~blue2[i];
312 }
313 for (i = 0; i < 4; i++) {
314 red4[i] = ~red4[i];
315 green4[i] = ~green4[i];
316 blue4[i] = ~blue4[i];
317 }
318 for (i = 0; i < 8; i++) {
319 red8[i] = ~red8[i];
320 green8[i] = ~green8[i];
321 blue8[i] = ~blue8[i];
322 }
323 for (i = 0; i < 16; i++) {
324 red16[i] = ~red16[i];
325 green16[i] = ~green16[i];
326 blue16[i] = ~blue16[i];
327 }
328}
329
330
331 /*
332 * Visible symbols for modules
333 */
334
335EXPORT_SYMBOL(fb_alloc_cmap);
336EXPORT_SYMBOL(fb_dealloc_cmap);
337EXPORT_SYMBOL(fb_copy_cmap);
338EXPORT_SYMBOL(fb_set_cmap);
339EXPORT_SYMBOL(fb_default_cmap);
340EXPORT_SYMBOL(fb_invert_cmaps);