source: src/linux/universal/linux-3.18/drivers/video/fbdev/core/fbcmap.c @ 31869

Last change on this file since 31869 was 31869, checked in by brainslayer, 3 months ago

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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
20static u16 red2[] __read_mostly = {
21    0x0000, 0xaaaa
22};
23static u16 green2[] __read_mostly = {
24    0x0000, 0xaaaa
25};
26static u16 blue2[] __read_mostly = {
27    0x0000, 0xaaaa
28};
29
30static u16 red4[] __read_mostly = {
31    0x0000, 0xaaaa, 0x5555, 0xffff
32};
33static u16 green4[] __read_mostly = {
34    0x0000, 0xaaaa, 0x5555, 0xffff
35};
36static u16 blue4[] __read_mostly = {
37    0x0000, 0xaaaa, 0x5555, 0xffff
38};
39
40static u16 red8[] __read_mostly = {
41    0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa
42};
43static u16 green8[] __read_mostly = {
44    0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa
45};
46static u16 blue8[] __read_mostly = {
47    0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa
48};
49
50static u16 red16[] __read_mostly = {
51    0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa,
52    0x5555, 0x5555, 0x5555, 0x5555, 0xffff, 0xffff, 0xffff, 0xffff
53};
54static u16 green16[] __read_mostly = {
55    0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa,
56    0x5555, 0x5555, 0xffff, 0xffff, 0x5555, 0x5555, 0xffff, 0xffff
57};
58static u16 blue16[] __read_mostly = {
59    0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa,
60    0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff
61};
62
63static const struct fb_cmap default_2_colors = {
64    .len=2, .red=red2, .green=green2, .blue=blue2
65};
66static const struct fb_cmap default_8_colors = {
67    .len=8, .red=red8, .green=green8, .blue=blue8
68};
69static const struct fb_cmap default_4_colors = {
70    .len=4, .red=red4, .green=green4, .blue=blue4
71};
72static 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
92int 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
126fail:
127        fb_dealloc_cmap(cmap);
128        return ret;
129}
130
131int 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
145void 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
164int fb_copy_cmap(const struct fb_cmap *from, struct fb_cmap *to)
165{
166        unsigned int tooff = 0, fromoff = 0;
167        size_t size;
168
169        if (to->start > from->start)
170                fromoff = to->start - from->start;
171        else
172                tooff = from->start - to->start;
173        if (fromoff >= from->len || tooff >= to->len)
174                return -EINVAL;
175
176        size = min_t(size_t, to->len - tooff, from->len - fromoff);
177        if (size == 0)
178                return -EINVAL;
179        size *= sizeof(u16);
180
181        memcpy(to->red+tooff, from->red+fromoff, size);
182        memcpy(to->green+tooff, from->green+fromoff, size);
183        memcpy(to->blue+tooff, from->blue+fromoff, size);
184        if (from->transp && to->transp)
185                memcpy(to->transp+tooff, from->transp+fromoff, size);
186        return 0;
187}
188
189int fb_cmap_to_user(const struct fb_cmap *from, struct fb_cmap_user *to)
190{
191        unsigned int tooff = 0, fromoff = 0;
192        size_t size;
193
194        if (to->start > from->start)
195                fromoff = to->start - from->start;
196        else
197                tooff = from->start - to->start;
198        if (fromoff >= from->len || tooff >= to->len)
199                return -EINVAL;
200
201        size = min_t(size_t, to->len - tooff, from->len - fromoff);
202        if (size == 0)
203                return -EINVAL;
204        size *= sizeof(u16);
205
206        if (copy_to_user(to->red+tooff, from->red+fromoff, size))
207                return -EFAULT;
208        if (copy_to_user(to->green+tooff, from->green+fromoff, size))
209                return -EFAULT;
210        if (copy_to_user(to->blue+tooff, from->blue+fromoff, size))
211                return -EFAULT;
212        if (from->transp && to->transp)
213                if (copy_to_user(to->transp+tooff, from->transp+fromoff, size))
214                        return -EFAULT;
215        return 0;
216}
217
218/**
219 *      fb_set_cmap - set the colormap
220 *      @cmap: frame buffer colormap structure
221 *      @info: frame buffer info structure
222 *
223 *      Sets the colormap @cmap for a screen of device @info.
224 *
225 *      Returns negative errno on error, or zero on success.
226 *
227 */
228
229int fb_set_cmap(struct fb_cmap *cmap, struct fb_info *info)
230{
231        int i, start, rc = 0;
232        u16 *red, *green, *blue, *transp;
233        u_int hred, hgreen, hblue, htransp = 0xffff;
234
235        red = cmap->red;
236        green = cmap->green;
237        blue = cmap->blue;
238        transp = cmap->transp;
239        start = cmap->start;
240
241        if (start < 0 || (!info->fbops->fb_setcolreg &&
242                          !info->fbops->fb_setcmap))
243                return -EINVAL;
244        if (info->fbops->fb_setcmap) {
245                rc = info->fbops->fb_setcmap(cmap, info);
246        } else {
247                for (i = 0; i < cmap->len; i++) {
248                        hred = *red++;
249                        hgreen = *green++;
250                        hblue = *blue++;
251                        if (transp)
252                                htransp = *transp++;
253                        if (info->fbops->fb_setcolreg(start++,
254                                                      hred, hgreen, hblue,
255                                                      htransp, info))
256                                break;
257                }
258        }
259        if (rc == 0)
260                fb_copy_cmap(cmap, &info->cmap);
261
262        return rc;
263}
264
265int fb_set_user_cmap(struct fb_cmap_user *cmap, struct fb_info *info)
266{
267        int rc, size = cmap->len * sizeof(u16);
268        struct fb_cmap umap;
269
270        if (size < 0 || size < cmap->len)
271                return -E2BIG;
272
273        memset(&umap, 0, sizeof(struct fb_cmap));
274        rc = fb_alloc_cmap_gfp(&umap, cmap->len, cmap->transp != NULL,
275                                GFP_KERNEL);
276        if (rc)
277                return rc;
278        if (copy_from_user(umap.red, cmap->red, size) ||
279            copy_from_user(umap.green, cmap->green, size) ||
280            copy_from_user(umap.blue, cmap->blue, size) ||
281            (cmap->transp && copy_from_user(umap.transp, cmap->transp, size))) {
282                rc = -EFAULT;
283                goto out;
284        }
285        umap.start = cmap->start;
286        if (!lock_fb_info(info)) {
287                rc = -ENODEV;
288                goto out;
289        }
290
291        rc = fb_set_cmap(&umap, info);
292        unlock_fb_info(info);
293out:
294        fb_dealloc_cmap(&umap);
295        return rc;
296}
297
298/**
299 *      fb_default_cmap - get default colormap
300 *      @len: size of palette for a depth
301 *
302 *      Gets the default colormap for a specific screen depth.  @len
303 *      is the size of the palette for a particular screen depth.
304 *
305 *      Returns pointer to a frame buffer colormap structure.
306 *
307 */
308
309const struct fb_cmap *fb_default_cmap(int len)
310{
311    if (len <= 2)
312        return &default_2_colors;
313    if (len <= 4)
314        return &default_4_colors;
315    if (len <= 8)
316        return &default_8_colors;
317    return &default_16_colors;
318}
319
320
321/**
322 *      fb_invert_cmaps - invert all defaults colormaps
323 *
324 *      Invert all default colormaps.
325 *
326 */
327
328void fb_invert_cmaps(void)
329{
330    u_int i;
331
332    for (i = 0; i < ARRAY_SIZE(red2); i++) {
333        red2[i] = ~red2[i];
334        green2[i] = ~green2[i];
335        blue2[i] = ~blue2[i];
336    }
337    for (i = 0; i < ARRAY_SIZE(red4); i++) {
338        red4[i] = ~red4[i];
339        green4[i] = ~green4[i];
340        blue4[i] = ~blue4[i];
341    }
342    for (i = 0; i < ARRAY_SIZE(red8); i++) {
343        red8[i] = ~red8[i];
344        green8[i] = ~green8[i];
345        blue8[i] = ~blue8[i];
346    }
347    for (i = 0; i < ARRAY_SIZE(red16); i++) {
348        red16[i] = ~red16[i];
349        green16[i] = ~green16[i];
350        blue16[i] = ~blue16[i];
351    }
352}
353
354
355    /*
356     *  Visible symbols for modules
357     */
358
359EXPORT_SYMBOL(fb_alloc_cmap);
360EXPORT_SYMBOL(fb_dealloc_cmap);
361EXPORT_SYMBOL(fb_copy_cmap);
362EXPORT_SYMBOL(fb_set_cmap);
363EXPORT_SYMBOL(fb_default_cmap);
364EXPORT_SYMBOL(fb_invert_cmaps);
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