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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 | |
22a95949 | 83 | * @flags: flags for kmalloc memory allocation |
1da177e4 LT |
84 | * |
85 | * Allocates memory for a colormap @cmap. @len is the | |
86 | * number of entries in the palette. | |
87 | * | |
db77ec27 | 88 | * Returns negative errno on error, or zero on success. |
1da177e4 LT |
89 | * |
90 | */ | |
91 | ||
1e7c7804 | 92 | int fb_alloc_cmap_gfp(struct fb_cmap *cmap, int len, int transp, gfp_t flags) |
1da177e4 | 93 | { |
c353103d | 94 | int size = len * sizeof(u16); |
1e7c7804 | 95 | int ret = -ENOMEM; |
1da177e4 | 96 | |
c353103d DC |
97 | if (cmap->len != len) { |
98 | fb_dealloc_cmap(cmap); | |
99 | if (!len) | |
100 | return 0; | |
101 | ||
1e7c7804 | 102 | cmap->red = kmalloc(size, flags); |
c353103d DC |
103 | if (!cmap->red) |
104 | goto fail; | |
1e7c7804 | 105 | cmap->green = kmalloc(size, flags); |
c353103d DC |
106 | if (!cmap->green) |
107 | goto fail; | |
1e7c7804 | 108 | cmap->blue = kmalloc(size, flags); |
c353103d DC |
109 | if (!cmap->blue) |
110 | goto fail; | |
111 | if (transp) { | |
1e7c7804 | 112 | cmap->transp = kmalloc(size, flags); |
c353103d DC |
113 | if (!cmap->transp) |
114 | goto fail; | |
115 | } else { | |
116 | cmap->transp = NULL; | |
117 | } | |
118 | } | |
119 | cmap->start = 0; | |
120 | cmap->len = len; | |
1e7c7804 DC |
121 | ret = fb_copy_cmap(fb_default_cmap(len), cmap); |
122 | if (ret) | |
123 | goto fail; | |
c353103d | 124 | return 0; |
1da177e4 LT |
125 | |
126 | fail: | |
c353103d | 127 | fb_dealloc_cmap(cmap); |
1e7c7804 DC |
128 | return ret; |
129 | } | |
130 | ||
131 | int fb_alloc_cmap(struct fb_cmap *cmap, int len, int transp) | |
132 | { | |
133 | return fb_alloc_cmap_gfp(cmap, len, transp, GFP_ATOMIC); | |
1da177e4 LT |
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 | ||
145 | void 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 | ||
adf6b206 | 164 | int fb_copy_cmap(const struct fb_cmap *from, struct fb_cmap *to) |
1da177e4 LT |
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 | ||
adf6b206 | 188 | int fb_cmap_to_user(const struct fb_cmap *from, struct fb_cmap_user *to) |
1da177e4 LT |
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 | ||
227 | int fb_set_cmap(struct fb_cmap *cmap, struct fb_info *info) | |
228 | { | |
03e259a9 | 229 | int i, start, rc = 0; |
1da177e4 LT |
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 | ||
71494376 BH |
239 | if (start < 0 || (!info->fbops->fb_setcolreg && |
240 | !info->fbops->fb_setcmap)) | |
1da177e4 | 241 | return -EINVAL; |
03e259a9 MJ |
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 | } | |
1da177e4 | 256 | } |
03e259a9 MJ |
257 | if (rc == 0) |
258 | fb_copy_cmap(cmap, &info->cmap); | |
259 | ||
260 | return rc; | |
1da177e4 LT |
261 | } |
262 | ||
263 | int fb_set_user_cmap(struct fb_cmap_user *cmap, struct fb_info *info) | |
264 | { | |
03e259a9 MJ |
265 | int rc, size = cmap->len * sizeof(u16); |
266 | struct fb_cmap umap; | |
1da177e4 | 267 | |
1e7c7804 DC |
268 | if (size < 0 || size < cmap->len) |
269 | return -E2BIG; | |
270 | ||
03e259a9 | 271 | memset(&umap, 0, sizeof(struct fb_cmap)); |
1e7c7804 DC |
272 | rc = fb_alloc_cmap_gfp(&umap, cmap->len, cmap->transp != NULL, |
273 | GFP_KERNEL); | |
03e259a9 | 274 | if (rc) |
71494376 | 275 | return rc; |
03e259a9 MJ |
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))) { | |
1f5e31d7 AR |
280 | rc = -EFAULT; |
281 | goto out; | |
71494376 | 282 | } |
03e259a9 | 283 | umap.start = cmap->start; |
1f5e31d7 AR |
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 | } | |
03e259a9 | 293 | rc = fb_set_cmap(&umap, info); |
1f5e31d7 AR |
294 | out1: |
295 | unlock_fb_info(info); | |
296 | out: | |
03e259a9 MJ |
297 | fb_dealloc_cmap(&umap); |
298 | return rc; | |
1da177e4 LT |
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 | ||
adf6b206 | 312 | const struct fb_cmap *fb_default_cmap(int len) |
1da177e4 LT |
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 | ||
331 | void fb_invert_cmaps(void) | |
332 | { | |
333 | u_int i; | |
334 | ||
adf6b206 | 335 | for (i = 0; i < ARRAY_SIZE(red2); i++) { |
1da177e4 LT |
336 | red2[i] = ~red2[i]; |
337 | green2[i] = ~green2[i]; | |
338 | blue2[i] = ~blue2[i]; | |
339 | } | |
adf6b206 | 340 | for (i = 0; i < ARRAY_SIZE(red4); i++) { |
1da177e4 LT |
341 | red4[i] = ~red4[i]; |
342 | green4[i] = ~green4[i]; | |
343 | blue4[i] = ~blue4[i]; | |
344 | } | |
adf6b206 | 345 | for (i = 0; i < ARRAY_SIZE(red8); i++) { |
1da177e4 LT |
346 | red8[i] = ~red8[i]; |
347 | green8[i] = ~green8[i]; | |
348 | blue8[i] = ~blue8[i]; | |
349 | } | |
adf6b206 | 350 | for (i = 0; i < ARRAY_SIZE(red16); i++) { |
1da177e4 LT |
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 | ||
362 | EXPORT_SYMBOL(fb_alloc_cmap); | |
363 | EXPORT_SYMBOL(fb_dealloc_cmap); | |
364 | EXPORT_SYMBOL(fb_copy_cmap); | |
365 | EXPORT_SYMBOL(fb_set_cmap); | |
366 | EXPORT_SYMBOL(fb_default_cmap); | |
367 | EXPORT_SYMBOL(fb_invert_cmaps); |