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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> |
16 | #include <linux/fb.h> |
17 | #include <linux/slab.h> |
18 | #include <linux/uaccess.h> |
19 | |
20 | static u16 red2[] __read_mostly = { |
21 | 0x0000, 0xaaaa |
22 | }; |
23 | static u16 green2[] __read_mostly = { |
24 | 0x0000, 0xaaaa |
25 | }; |
26 | static u16 blue2[] __read_mostly = { |
27 | 0x0000, 0xaaaa |
28 | }; |
29 | |
30 | static u16 red4[] __read_mostly = { |
31 | 0x0000, 0xaaaa, 0x5555, 0xffff |
32 | }; |
33 | static u16 green4[] __read_mostly = { |
34 | 0x0000, 0xaaaa, 0x5555, 0xffff |
35 | }; |
36 | static u16 blue4[] __read_mostly = { |
37 | 0x0000, 0xaaaa, 0x5555, 0xffff |
38 | }; |
39 | |
40 | static u16 red8[] __read_mostly = { |
41 | 0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa |
42 | }; |
43 | static u16 green8[] __read_mostly = { |
44 | 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa |
45 | }; |
46 | static u16 blue8[] __read_mostly = { |
47 | 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa |
48 | }; |
49 | |
50 | static u16 red16[] __read_mostly = { |
51 | 0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa, |
52 | 0x5555, 0x5555, 0x5555, 0x5555, 0xffff, 0xffff, 0xffff, 0xffff |
53 | }; |
54 | static u16 green16[] __read_mostly = { |
55 | 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa, |
56 | 0x5555, 0x5555, 0xffff, 0xffff, 0x5555, 0x5555, 0xffff, 0xffff |
57 | }; |
58 | static u16 blue16[] __read_mostly = { |
59 | 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, |
60 | 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff |
61 | }; |
62 | |
63 | static const struct fb_cmap default_2_colors = { |
64 | .len=2, .red=red2, .green=green2, .blue=blue2 |
65 | }; |
66 | static const struct fb_cmap default_8_colors = { |
67 | .len=8, .red=red8, .green=green8, .blue=blue8 |
68 | }; |
69 | static const struct fb_cmap default_4_colors = { |
70 | .len=4, .red=red4, .green=green4, .blue=blue4 |
71 | }; |
72 | static const struct fb_cmap default_16_colors = { |
73 | .len=16, .red=red16, .green=green16, .blue=blue16 |
74 | }; |
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 | * @flags: flags for kmalloc memory allocation |
84 | * |
85 | * Allocates memory for a colormap @cmap. @len is the |
86 | * number of entries in the palette. |
87 | * |
88 | * Returns negative errno on error, or zero on success. |
89 | * |
90 | */ |
91 | |
92 | int fb_alloc_cmap_gfp(struct fb_cmap *cmap, int len, int transp, gfp_t flags) |
93 | { |
94 | int size = len * sizeof(u16); |
95 | int ret = -ENOMEM; |
96 | |
97 | if (cmap->len != len) { |
98 | fb_dealloc_cmap(cmap); |
99 | if (!len) |
100 | return 0; |
101 | |
102 | cmap->red = kmalloc(size, flags); |
103 | if (!cmap->red) |
104 | goto fail; |
105 | cmap->green = kmalloc(size, flags); |
106 | if (!cmap->green) |
107 | goto fail; |
108 | cmap->blue = kmalloc(size, flags); |
109 | if (!cmap->blue) |
110 | goto fail; |
111 | if (transp) { |
112 | cmap->transp = kmalloc(size, flags); |
113 | if (!cmap->transp) |
114 | goto fail; |
115 | } else { |
116 | cmap->transp = NULL; |
117 | } |
118 | } |
119 | cmap->start = 0; |
120 | cmap->len = len; |
121 | ret = fb_copy_cmap(fb_default_cmap(len), cmap); |
122 | if (ret) |
123 | goto fail; |
124 | return 0; |
125 | |
126 | fail: |
127 | fb_dealloc_cmap(cmap); |
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); |
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 | |
164 | int fb_copy_cmap(const struct fb_cmap *from, struct fb_cmap *to) |
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 | |
188 | int fb_cmap_to_user(const struct fb_cmap *from, struct fb_cmap_user *to) |
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 | { |
229 | int i, start, rc = 0; |
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 | |
239 | if (start < 0 || (!info->fbops->fb_setcolreg && |
240 | !info->fbops->fb_setcmap)) |
241 | return -EINVAL; |
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 | } |
256 | } |
257 | if (rc == 0) |
258 | fb_copy_cmap(cmap, &info->cmap); |
259 | |
260 | return rc; |
261 | } |
262 | |
263 | int fb_set_user_cmap(struct fb_cmap_user *cmap, struct fb_info *info) |
264 | { |
265 | int rc, size = cmap->len * sizeof(u16); |
266 | struct fb_cmap umap; |
267 | |
268 | if (size < 0 || size < cmap->len) |
269 | return -E2BIG; |
270 | |
271 | memset(&umap, 0, sizeof(struct fb_cmap)); |
272 | rc = fb_alloc_cmap_gfp(&umap, cmap->len, cmap->transp != NULL, |
273 | GFP_KERNEL); |
274 | if (rc) |
275 | return rc; |
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))) { |
280 | rc = -EFAULT; |
281 | goto out; |
282 | } |
283 | umap.start = cmap->start; |
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 | } |
293 | rc = fb_set_cmap(&umap, info); |
294 | out1: |
295 | unlock_fb_info(info); |
296 | out: |
297 | fb_dealloc_cmap(&umap); |
298 | return rc; |
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 | |
312 | const struct fb_cmap *fb_default_cmap(int len) |
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 | |
335 | for (i = 0; i < ARRAY_SIZE(red2); i++) { |
336 | red2[i] = ~red2[i]; |
337 | green2[i] = ~green2[i]; |
338 | blue2[i] = ~blue2[i]; |
339 | } |
340 | for (i = 0; i < ARRAY_SIZE(red4); i++) { |
341 | red4[i] = ~red4[i]; |
342 | green4[i] = ~green4[i]; |
343 | blue4[i] = ~blue4[i]; |
344 | } |
345 | for (i = 0; i < ARRAY_SIZE(red8); i++) { |
346 | red8[i] = ~red8[i]; |
347 | green8[i] = ~green8[i]; |
348 | blue8[i] = ~blue8[i]; |
349 | } |
350 | for (i = 0; i < ARRAY_SIZE(red16); i++) { |
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); |
368 |
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