Commit | Line | Data |
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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 | { | |
c353103d | 93 | int size = len * sizeof(u16); |
1da177e4 | 94 | |
c353103d DC |
95 | 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; | |
1da177e4 LT |
121 | |
122 | fail: | |
c353103d DC |
123 | fb_dealloc_cmap(cmap); |
124 | return -ENOMEM; | |
1da177e4 LT |
125 | } |
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 | ||
136 | void 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 | ||
adf6b206 | 155 | int fb_copy_cmap(const struct fb_cmap *from, struct fb_cmap *to) |
1da177e4 LT |
156 | { |
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 | ||
adf6b206 | 179 | int fb_cmap_to_user(const struct fb_cmap *from, struct fb_cmap_user *to) |
1da177e4 LT |
180 | { |
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 | ||
218 | int fb_set_cmap(struct fb_cmap *cmap, struct fb_info *info) | |
219 | { | |
03e259a9 | 220 | int i, start, rc = 0; |
1da177e4 LT |
221 | 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 | ||
71494376 BH |
230 | if (start < 0 || (!info->fbops->fb_setcolreg && |
231 | !info->fbops->fb_setcmap)) | |
1da177e4 | 232 | return -EINVAL; |
03e259a9 MJ |
233 | 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 | } | |
1da177e4 | 247 | } |
03e259a9 MJ |
248 | if (rc == 0) |
249 | fb_copy_cmap(cmap, &info->cmap); | |
250 | ||
251 | return rc; | |
1da177e4 LT |
252 | } |
253 | ||
254 | int fb_set_user_cmap(struct fb_cmap_user *cmap, struct fb_info *info) | |
255 | { | |
03e259a9 MJ |
256 | int rc, size = cmap->len * sizeof(u16); |
257 | struct fb_cmap umap; | |
1da177e4 | 258 | |
03e259a9 MJ |
259 | memset(&umap, 0, sizeof(struct fb_cmap)); |
260 | rc = fb_alloc_cmap(&umap, cmap->len, cmap->transp != NULL); | |
261 | if (rc) | |
71494376 | 262 | return rc; |
03e259a9 MJ |
263 | 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))) { | |
1f5e31d7 AR |
267 | rc = -EFAULT; |
268 | goto out; | |
71494376 | 269 | } |
03e259a9 | 270 | umap.start = cmap->start; |
1f5e31d7 AR |
271 | 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 | } | |
03e259a9 | 280 | rc = fb_set_cmap(&umap, info); |
1f5e31d7 AR |
281 | out1: |
282 | unlock_fb_info(info); | |
283 | out: | |
03e259a9 MJ |
284 | fb_dealloc_cmap(&umap); |
285 | return rc; | |
1da177e4 LT |
286 | } |
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 | ||
adf6b206 | 299 | const struct fb_cmap *fb_default_cmap(int len) |
1da177e4 LT |
300 | { |
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 | ||
318 | void fb_invert_cmaps(void) | |
319 | { | |
320 | u_int i; | |
321 | ||
adf6b206 | 322 | for (i = 0; i < ARRAY_SIZE(red2); i++) { |
1da177e4 LT |
323 | red2[i] = ~red2[i]; |
324 | green2[i] = ~green2[i]; | |
325 | blue2[i] = ~blue2[i]; | |
326 | } | |
adf6b206 | 327 | for (i = 0; i < ARRAY_SIZE(red4); i++) { |
1da177e4 LT |
328 | red4[i] = ~red4[i]; |
329 | green4[i] = ~green4[i]; | |
330 | blue4[i] = ~blue4[i]; | |
331 | } | |
adf6b206 | 332 | for (i = 0; i < ARRAY_SIZE(red8); i++) { |
1da177e4 LT |
333 | red8[i] = ~red8[i]; |
334 | green8[i] = ~green8[i]; | |
335 | blue8[i] = ~blue8[i]; | |
336 | } | |
adf6b206 | 337 | for (i = 0; i < ARRAY_SIZE(red16); i++) { |
1da177e4 LT |
338 | 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 | ||
349 | EXPORT_SYMBOL(fb_alloc_cmap); | |
350 | EXPORT_SYMBOL(fb_dealloc_cmap); | |
351 | EXPORT_SYMBOL(fb_copy_cmap); | |
352 | EXPORT_SYMBOL(fb_set_cmap); | |
353 | EXPORT_SYMBOL(fb_default_cmap); | |
354 | EXPORT_SYMBOL(fb_invert_cmaps); |