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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 | * |
84 | * Allocates memory for a colormap @cmap. @len is the |
85 | * number of entries in the palette. |
86 | * |
87 | * Returns negative errno on error, or zero on success. |
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); |
118 | return -ENOMEM; |
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 | |
149 | int fb_copy_cmap(const 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 | |
173 | int fb_cmap_to_user(const 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 | |
212 | int fb_set_cmap(struct fb_cmap *cmap, struct fb_info *info) |
213 | { |
214 | int i, start, rc = 0; |
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 | |
224 | if (start < 0 || (!info->fbops->fb_setcolreg && |
225 | !info->fbops->fb_setcmap)) |
226 | return -EINVAL; |
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 | } |
241 | } |
242 | if (rc == 0) |
243 | fb_copy_cmap(cmap, &info->cmap); |
244 | |
245 | return rc; |
246 | } |
247 | |
248 | int fb_set_user_cmap(struct fb_cmap_user *cmap, struct fb_info *info) |
249 | { |
250 | int rc, size = cmap->len * sizeof(u16); |
251 | struct fb_cmap umap; |
252 | |
253 | memset(&umap, 0, sizeof(struct fb_cmap)); |
254 | rc = fb_alloc_cmap(&umap, cmap->len, cmap->transp != NULL); |
255 | if (rc) |
256 | return rc; |
257 | if (copy_from_user(umap.red, cmap->red, size) || |
258 | copy_from_user(umap.green, cmap->green, size) || |
259 | copy_from_user(umap.blue, cmap->blue, size) || |
260 | (cmap->transp && copy_from_user(umap.transp, cmap->transp, size))) { |
261 | rc = -EFAULT; |
262 | goto out; |
263 | } |
264 | umap.start = cmap->start; |
265 | if (!lock_fb_info(info)) { |
266 | rc = -ENODEV; |
267 | goto out; |
268 | } |
269 | if (cmap->start < 0 || (!info->fbops->fb_setcolreg && |
270 | !info->fbops->fb_setcmap)) { |
271 | rc = -EINVAL; |
272 | goto out1; |
273 | } |
274 | rc = fb_set_cmap(&umap, info); |
275 | out1: |
276 | unlock_fb_info(info); |
277 | out: |
278 | fb_dealloc_cmap(&umap); |
279 | return rc; |
280 | } |
281 | |
282 | /** |
283 | * fb_default_cmap - get default colormap |
284 | * @len: size of palette for a depth |
285 | * |
286 | * Gets the default colormap for a specific screen depth. @len |
287 | * is the size of the palette for a particular screen depth. |
288 | * |
289 | * Returns pointer to a frame buffer colormap structure. |
290 | * |
291 | */ |
292 | |
293 | const struct fb_cmap *fb_default_cmap(int len) |
294 | { |
295 | if (len <= 2) |
296 | return &default_2_colors; |
297 | if (len <= 4) |
298 | return &default_4_colors; |
299 | if (len <= 8) |
300 | return &default_8_colors; |
301 | return &default_16_colors; |
302 | } |
303 | |
304 | |
305 | /** |
306 | * fb_invert_cmaps - invert all defaults colormaps |
307 | * |
308 | * Invert all default colormaps. |
309 | * |
310 | */ |
311 | |
312 | void fb_invert_cmaps(void) |
313 | { |
314 | u_int i; |
315 | |
316 | for (i = 0; i < ARRAY_SIZE(red2); i++) { |
317 | red2[i] = ~red2[i]; |
318 | green2[i] = ~green2[i]; |
319 | blue2[i] = ~blue2[i]; |
320 | } |
321 | for (i = 0; i < ARRAY_SIZE(red4); i++) { |
322 | red4[i] = ~red4[i]; |
323 | green4[i] = ~green4[i]; |
324 | blue4[i] = ~blue4[i]; |
325 | } |
326 | for (i = 0; i < ARRAY_SIZE(red8); i++) { |
327 | red8[i] = ~red8[i]; |
328 | green8[i] = ~green8[i]; |
329 | blue8[i] = ~blue8[i]; |
330 | } |
331 | for (i = 0; i < ARRAY_SIZE(red16); i++) { |
332 | red16[i] = ~red16[i]; |
333 | green16[i] = ~green16[i]; |
334 | blue16[i] = ~blue16[i]; |
335 | } |
336 | } |
337 | |
338 | |
339 | /* |
340 | * Visible symbols for modules |
341 | */ |
342 | |
343 | EXPORT_SYMBOL(fb_alloc_cmap); |
344 | EXPORT_SYMBOL(fb_dealloc_cmap); |
345 | EXPORT_SYMBOL(fb_copy_cmap); |
346 | EXPORT_SYMBOL(fb_set_cmap); |
347 | EXPORT_SYMBOL(fb_default_cmap); |
348 | EXPORT_SYMBOL(fb_invert_cmaps); |
349 |
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