Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
1da177e4 LT |
16 | #include <linux/fb.h> |
17 | #include <linux/slab.h> | |
84902b7a | 18 | #include <linux/uaccess.h> |
1da177e4 | 19 | |
adf6b206 | 20 | static u16 red2[] __read_mostly = { |
1da177e4 LT |
21 | 0x0000, 0xaaaa |
22 | }; | |
adf6b206 | 23 | static u16 green2[] __read_mostly = { |
1da177e4 LT |
24 | 0x0000, 0xaaaa |
25 | }; | |
adf6b206 | 26 | static u16 blue2[] __read_mostly = { |
1da177e4 LT |
27 | 0x0000, 0xaaaa |
28 | }; | |
29 | ||
adf6b206 | 30 | static u16 red4[] __read_mostly = { |
1da177e4 LT |
31 | 0x0000, 0xaaaa, 0x5555, 0xffff |
32 | }; | |
adf6b206 | 33 | static u16 green4[] __read_mostly = { |
1da177e4 LT |
34 | 0x0000, 0xaaaa, 0x5555, 0xffff |
35 | }; | |
adf6b206 | 36 | static u16 blue4[] __read_mostly = { |
1da177e4 LT |
37 | 0x0000, 0xaaaa, 0x5555, 0xffff |
38 | }; | |
39 | ||
adf6b206 | 40 | static u16 red8[] __read_mostly = { |
1da177e4 LT |
41 | 0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa |
42 | }; | |
adf6b206 | 43 | static u16 green8[] __read_mostly = { |
1da177e4 LT |
44 | 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa |
45 | }; | |
adf6b206 | 46 | static u16 blue8[] __read_mostly = { |
1da177e4 LT |
47 | 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa |
48 | }; | |
49 | ||
adf6b206 | 50 | static u16 red16[] __read_mostly = { |
1da177e4 LT |
51 | 0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa, |
52 | 0x5555, 0x5555, 0x5555, 0x5555, 0xffff, 0xffff, 0xffff, 0xffff | |
53 | }; | |
adf6b206 | 54 | static u16 green16[] __read_mostly = { |
1da177e4 LT |
55 | 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa, |
56 | 0x5555, 0x5555, 0xffff, 0xffff, 0x5555, 0x5555, 0xffff, 0xffff | |
57 | }; | |
adf6b206 | 58 | static u16 blue16[] __read_mostly = { |
1da177e4 LT |
59 | 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, |
60 | 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff | |
61 | }; | |
62 | ||
adf6b206 HD |
63 | static const struct fb_cmap default_2_colors = { |
64 | .len=2, .red=red2, .green=green2, .blue=blue2 | |
1da177e4 | 65 | }; |
adf6b206 HD |
66 | static const struct fb_cmap default_8_colors = { |
67 | .len=8, .red=red8, .green=green8, .blue=blue8 | |
1da177e4 | 68 | }; |
adf6b206 HD |
69 | static const struct fb_cmap default_4_colors = { |
70 | .len=4, .red=red4, .green=green4, .blue=blue4 | |
1da177e4 | 71 | }; |
adf6b206 HD |
72 | static const struct fb_cmap default_16_colors = { |
73 | .len=16, .red=red16, .green=green16, .blue=blue16 | |
1da177e4 LT |
74 | }; |
75 | ||
76 | ||
adf6b206 | 77 | |
1da177e4 LT |
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 | * | |
db77ec27 | 87 | * Returns negative errno on error, or zero on success. |
1da177e4 LT |
88 | * |
89 | */ | |
90 | ||
91 | int 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 | ||
116 | fail: | |
117 | fb_dealloc_cmap(cmap); | |
db77ec27 | 118 | return -ENOMEM; |
1da177e4 LT |
119 | } |
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 | ||
130 | void 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 | ||
adf6b206 | 149 | int fb_copy_cmap(const struct fb_cmap *from, struct fb_cmap *to) |
1da177e4 LT |
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 | ||
adf6b206 | 173 | int fb_cmap_to_user(const struct fb_cmap *from, struct fb_cmap_user *to) |
1da177e4 LT |
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 | ||
212 | int fb_set_cmap(struct fb_cmap *cmap, struct fb_info *info) | |
213 | { | |
03e259a9 | 214 | int i, start, rc = 0; |
1da177e4 LT |
215 | 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 | ||
71494376 BH |
224 | if (start < 0 || (!info->fbops->fb_setcolreg && |
225 | !info->fbops->fb_setcmap)) | |
1da177e4 | 226 | return -EINVAL; |
03e259a9 MJ |
227 | 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 | } | |
1da177e4 | 241 | } |
03e259a9 MJ |
242 | if (rc == 0) |
243 | fb_copy_cmap(cmap, &info->cmap); | |
244 | ||
245 | return rc; | |
1da177e4 LT |
246 | } |
247 | ||
248 | int fb_set_user_cmap(struct fb_cmap_user *cmap, struct fb_info *info) | |
249 | { | |
03e259a9 MJ |
250 | int rc, size = cmap->len * sizeof(u16); |
251 | struct fb_cmap umap; | |
1da177e4 | 252 | |
03e259a9 MJ |
253 | if (cmap->start < 0 || (!info->fbops->fb_setcolreg && |
254 | !info->fbops->fb_setcmap)) | |
1da177e4 | 255 | return -EINVAL; |
71494376 | 256 | |
03e259a9 MJ |
257 | memset(&umap, 0, sizeof(struct fb_cmap)); |
258 | rc = fb_alloc_cmap(&umap, cmap->len, cmap->transp != NULL); | |
259 | if (rc) | |
71494376 | 260 | return rc; |
03e259a9 MJ |
261 | 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; | |
71494376 | 267 | } |
03e259a9 MJ |
268 | umap.start = cmap->start; |
269 | rc = fb_set_cmap(&umap, info); | |
270 | fb_dealloc_cmap(&umap); | |
271 | return rc; | |
1da177e4 LT |
272 | } |
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 | ||
adf6b206 | 285 | const struct fb_cmap *fb_default_cmap(int len) |
1da177e4 LT |
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 | ||
304 | void fb_invert_cmaps(void) | |
305 | { | |
306 | u_int i; | |
307 | ||
adf6b206 | 308 | for (i = 0; i < ARRAY_SIZE(red2); i++) { |
1da177e4 LT |
309 | red2[i] = ~red2[i]; |
310 | green2[i] = ~green2[i]; | |
311 | blue2[i] = ~blue2[i]; | |
312 | } | |
adf6b206 | 313 | for (i = 0; i < ARRAY_SIZE(red4); i++) { |
1da177e4 LT |
314 | red4[i] = ~red4[i]; |
315 | green4[i] = ~green4[i]; | |
316 | blue4[i] = ~blue4[i]; | |
317 | } | |
adf6b206 | 318 | for (i = 0; i < ARRAY_SIZE(red8); i++) { |
1da177e4 LT |
319 | red8[i] = ~red8[i]; |
320 | green8[i] = ~green8[i]; | |
321 | blue8[i] = ~blue8[i]; | |
322 | } | |
adf6b206 | 323 | for (i = 0; i < ARRAY_SIZE(red16); i++) { |
1da177e4 LT |
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 | ||
335 | EXPORT_SYMBOL(fb_alloc_cmap); | |
336 | EXPORT_SYMBOL(fb_dealloc_cmap); | |
337 | EXPORT_SYMBOL(fb_copy_cmap); | |
338 | EXPORT_SYMBOL(fb_set_cmap); | |
339 | EXPORT_SYMBOL(fb_default_cmap); | |
340 | EXPORT_SYMBOL(fb_invert_cmaps); |