Line data Source code
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_gfp - 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 0 : int fb_alloc_cmap_gfp(struct fb_cmap *cmap, int len, int transp, gfp_t flags)
93 : {
94 0 : int size = len * sizeof(u16);
95 0 : int ret = -ENOMEM;
96 :
97 0 : flags |= __GFP_NOWARN;
98 :
99 0 : if (cmap->len != len) {
100 0 : fb_dealloc_cmap(cmap);
101 0 : if (!len)
102 : return 0;
103 :
104 0 : cmap->red = kzalloc(size, flags);
105 0 : if (!cmap->red)
106 : goto fail;
107 0 : cmap->green = kzalloc(size, flags);
108 0 : if (!cmap->green)
109 : goto fail;
110 0 : cmap->blue = kzalloc(size, flags);
111 0 : if (!cmap->blue)
112 : goto fail;
113 0 : if (transp) {
114 0 : cmap->transp = kzalloc(size, flags);
115 0 : if (!cmap->transp)
116 : goto fail;
117 : } else {
118 0 : cmap->transp = NULL;
119 : }
120 : }
121 0 : cmap->start = 0;
122 0 : cmap->len = len;
123 0 : ret = fb_copy_cmap(fb_default_cmap(len), cmap);
124 0 : if (ret)
125 : goto fail;
126 : return 0;
127 :
128 : fail:
129 0 : fb_dealloc_cmap(cmap);
130 0 : return ret;
131 : }
132 :
133 0 : int fb_alloc_cmap(struct fb_cmap *cmap, int len, int transp)
134 : {
135 0 : return fb_alloc_cmap_gfp(cmap, len, transp, GFP_ATOMIC);
136 : }
137 :
138 : /**
139 : * fb_dealloc_cmap - deallocate a colormap
140 : * @cmap: frame buffer colormap structure
141 : *
142 : * Deallocates a colormap that was previously allocated with
143 : * fb_alloc_cmap().
144 : *
145 : */
146 :
147 0 : void fb_dealloc_cmap(struct fb_cmap *cmap)
148 : {
149 0 : kfree(cmap->red);
150 0 : kfree(cmap->green);
151 0 : kfree(cmap->blue);
152 0 : kfree(cmap->transp);
153 :
154 0 : cmap->red = cmap->green = cmap->blue = cmap->transp = NULL;
155 0 : cmap->len = 0;
156 0 : }
157 :
158 : /**
159 : * fb_copy_cmap - copy a colormap
160 : * @from: frame buffer colormap structure
161 : * @to: frame buffer colormap structure
162 : *
163 : * Copy contents of colormap from @from to @to.
164 : */
165 :
166 0 : int fb_copy_cmap(const struct fb_cmap *from, struct fb_cmap *to)
167 : {
168 0 : unsigned int tooff = 0, fromoff = 0;
169 : size_t size;
170 :
171 0 : if (to->start > from->start)
172 0 : fromoff = to->start - from->start;
173 : else
174 0 : tooff = from->start - to->start;
175 0 : if (fromoff >= from->len || tooff >= to->len)
176 : return -EINVAL;
177 :
178 0 : size = min_t(size_t, to->len - tooff, from->len - fromoff);
179 0 : if (size == 0)
180 : return -EINVAL;
181 0 : size *= sizeof(u16);
182 :
183 0 : memcpy(to->red+tooff, from->red+fromoff, size);
184 0 : memcpy(to->green+tooff, from->green+fromoff, size);
185 0 : memcpy(to->blue+tooff, from->blue+fromoff, size);
186 0 : if (from->transp && to->transp)
187 0 : memcpy(to->transp+tooff, from->transp+fromoff, size);
188 : return 0;
189 : }
190 :
191 0 : int fb_cmap_to_user(const struct fb_cmap *from, struct fb_cmap_user *to)
192 : {
193 0 : unsigned int tooff = 0, fromoff = 0;
194 : size_t size;
195 :
196 0 : if (to->start > from->start)
197 0 : fromoff = to->start - from->start;
198 : else
199 0 : tooff = from->start - to->start;
200 0 : if (fromoff >= from->len || tooff >= to->len)
201 : return -EINVAL;
202 :
203 0 : size = min_t(size_t, to->len - tooff, from->len - fromoff);
204 0 : if (size == 0)
205 : return -EINVAL;
206 0 : size *= sizeof(u16);
207 :
208 0 : if (copy_to_user(to->red+tooff, from->red+fromoff, size))
209 : return -EFAULT;
210 0 : if (copy_to_user(to->green+tooff, from->green+fromoff, size))
211 : return -EFAULT;
212 0 : if (copy_to_user(to->blue+tooff, from->blue+fromoff, size))
213 : return -EFAULT;
214 0 : if (from->transp && to->transp)
215 0 : if (copy_to_user(to->transp+tooff, from->transp+fromoff, size))
216 : return -EFAULT;
217 : return 0;
218 : }
219 :
220 : /**
221 : * fb_set_cmap - set the colormap
222 : * @cmap: frame buffer colormap structure
223 : * @info: frame buffer info structure
224 : *
225 : * Sets the colormap @cmap for a screen of device @info.
226 : *
227 : * Returns negative errno on error, or zero on success.
228 : *
229 : */
230 :
231 0 : int fb_set_cmap(struct fb_cmap *cmap, struct fb_info *info)
232 : {
233 0 : int i, start, rc = 0;
234 : u16 *red, *green, *blue, *transp;
235 0 : u_int hred, hgreen, hblue, htransp = 0xffff;
236 :
237 0 : red = cmap->red;
238 0 : green = cmap->green;
239 0 : blue = cmap->blue;
240 0 : transp = cmap->transp;
241 0 : start = cmap->start;
242 :
243 0 : if (start < 0 || (!info->fbops->fb_setcolreg &&
244 0 : !info->fbops->fb_setcmap))
245 : return -EINVAL;
246 0 : if (info->fbops->fb_setcmap) {
247 0 : rc = info->fbops->fb_setcmap(cmap, info);
248 : } else {
249 0 : for (i = 0; i < cmap->len; i++) {
250 0 : hred = *red++;
251 0 : hgreen = *green++;
252 0 : hblue = *blue++;
253 0 : if (transp)
254 0 : htransp = *transp++;
255 0 : if (info->fbops->fb_setcolreg(start++,
256 : hred, hgreen, hblue,
257 : htransp, info))
258 : break;
259 : }
260 : }
261 0 : if (rc == 0)
262 0 : fb_copy_cmap(cmap, &info->cmap);
263 :
264 : return rc;
265 : }
266 :
267 0 : int fb_set_user_cmap(struct fb_cmap_user *cmap, struct fb_info *info)
268 : {
269 0 : int rc, size = cmap->len * sizeof(u16);
270 : struct fb_cmap umap;
271 :
272 0 : if (size < 0 || size < cmap->len)
273 : return -E2BIG;
274 :
275 0 : memset(&umap, 0, sizeof(struct fb_cmap));
276 0 : rc = fb_alloc_cmap_gfp(&umap, cmap->len, cmap->transp != NULL,
277 : GFP_KERNEL);
278 0 : if (rc)
279 : return rc;
280 0 : if (copy_from_user(umap.red, cmap->red, size) ||
281 0 : copy_from_user(umap.green, cmap->green, size) ||
282 0 : copy_from_user(umap.blue, cmap->blue, size) ||
283 0 : (cmap->transp && copy_from_user(umap.transp, cmap->transp, size))) {
284 : rc = -EFAULT;
285 : goto out;
286 : }
287 0 : umap.start = cmap->start;
288 0 : lock_fb_info(info);
289 0 : rc = fb_set_cmap(&umap, info);
290 : unlock_fb_info(info);
291 : out:
292 0 : fb_dealloc_cmap(&umap);
293 0 : return rc;
294 : }
295 :
296 : /**
297 : * fb_default_cmap - get default colormap
298 : * @len: size of palette for a depth
299 : *
300 : * Gets the default colormap for a specific screen depth. @len
301 : * is the size of the palette for a particular screen depth.
302 : *
303 : * Returns pointer to a frame buffer colormap structure.
304 : *
305 : */
306 :
307 0 : const struct fb_cmap *fb_default_cmap(int len)
308 : {
309 0 : if (len <= 2)
310 : return &default_2_colors;
311 0 : if (len <= 4)
312 : return &default_4_colors;
313 0 : if (len <= 8)
314 : return &default_8_colors;
315 0 : return &default_16_colors;
316 : }
317 :
318 :
319 : /**
320 : * fb_invert_cmaps - invert all defaults colormaps
321 : *
322 : * Invert all default colormaps.
323 : *
324 : */
325 :
326 0 : void fb_invert_cmaps(void)
327 : {
328 : u_int i;
329 :
330 0 : for (i = 0; i < ARRAY_SIZE(red2); i++) {
331 0 : red2[i] = ~red2[i];
332 0 : green2[i] = ~green2[i];
333 0 : blue2[i] = ~blue2[i];
334 : }
335 0 : for (i = 0; i < ARRAY_SIZE(red4); i++) {
336 0 : red4[i] = ~red4[i];
337 0 : green4[i] = ~green4[i];
338 0 : blue4[i] = ~blue4[i];
339 : }
340 0 : for (i = 0; i < ARRAY_SIZE(red8); i++) {
341 0 : red8[i] = ~red8[i];
342 0 : green8[i] = ~green8[i];
343 0 : blue8[i] = ~blue8[i];
344 : }
345 0 : for (i = 0; i < ARRAY_SIZE(red16); i++) {
346 0 : red16[i] = ~red16[i];
347 0 : green16[i] = ~green16[i];
348 0 : blue16[i] = ~blue16[i];
349 : }
350 0 : }
351 :
352 :
353 : /*
354 : * Visible symbols for modules
355 : */
356 :
357 : EXPORT_SYMBOL(fb_alloc_cmap);
358 : EXPORT_SYMBOL(fb_dealloc_cmap);
359 : EXPORT_SYMBOL(fb_copy_cmap);
360 : EXPORT_SYMBOL(fb_set_cmap);
361 : EXPORT_SYMBOL(fb_default_cmap);
362 : EXPORT_SYMBOL(fb_invert_cmaps);
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