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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [video/] [fbcmap.c] - Blame information for rev 62

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Line No. Rev Author Line
1 62 marcus.erl
/*
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 = {
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    0x0000, 0xaaaa
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};
26
static u16 blue2[] __read_mostly = {
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    0x0000, 0xaaaa
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};
29
 
30
static u16 red4[] __read_mostly = {
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    0x0000, 0xaaaa, 0x5555, 0xffff
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};
33
static u16 green4[] __read_mostly = {
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    0x0000, 0xaaaa, 0x5555, 0xffff
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};
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static u16 blue4[] __read_mostly = {
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    0x0000, 0xaaaa, 0x5555, 0xffff
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};
39
 
40
static u16 red8[] __read_mostly = {
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    0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa
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};
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static u16 green8[] __read_mostly = {
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    0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa
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};
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static u16 blue8[] __read_mostly = {
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    0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa
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};
49
 
50
static u16 red16[] __read_mostly = {
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    0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa,
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    0x5555, 0x5555, 0x5555, 0x5555, 0xffff, 0xffff, 0xffff, 0xffff
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};
54
static u16 green16[] __read_mostly = {
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    0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa,
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    0x5555, 0x5555, 0xffff, 0xffff, 0x5555, 0x5555, 0xffff, 0xffff
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};
58
static u16 blue16[] __read_mostly = {
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    0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa,
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    0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff
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};
62
 
63
static const struct fb_cmap default_2_colors = {
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    .len=2, .red=red2, .green=green2, .blue=blue2
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};
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static const struct fb_cmap default_8_colors = {
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    .len=8, .red=red8, .green=green8, .blue=blue8
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};
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static const struct fb_cmap default_4_colors = {
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    .len=4, .red=red4, .green=green4, .blue=blue4
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};
72
static const struct fb_cmap default_16_colors = {
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    .len=16, .red=red16, .green=green16, .blue=blue16
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};
75
 
76
 
77
 
78
/**
79
 *      fb_alloc_cmap - allocate a colormap
80
 *      @cmap: frame buffer colormap structure
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 *      @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) {
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        fb_dealloc_cmap(cmap);
97
        if (!len)
98
            return 0;
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        if (!(cmap->red = kmalloc(size, GFP_ATOMIC)))
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            goto fail;
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        if (!(cmap->green = kmalloc(size, GFP_ATOMIC)))
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            goto fail;
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        if (!(cmap->blue = kmalloc(size, GFP_ATOMIC)))
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            goto fail;
105
        if (transp) {
106
            if (!(cmap->transp = kmalloc(size, GFP_ATOMIC)))
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                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
        if (cmap->start < 0 || (!info->fbops->fb_setcolreg &&
254
                                !info->fbops->fb_setcmap))
255
                return -EINVAL;
256
 
257
        memset(&umap, 0, sizeof(struct fb_cmap));
258
        rc = fb_alloc_cmap(&umap, cmap->len, cmap->transp != NULL);
259
        if (rc)
260
                return rc;
261
        if (copy_from_user(umap.red, cmap->red, size) ||
262
            copy_from_user(umap.green, cmap->green, size) ||
263
            copy_from_user(umap.blue, cmap->blue, size) ||
264
            (cmap->transp && copy_from_user(umap.transp, cmap->transp, size))) {
265
                fb_dealloc_cmap(&umap);
266
                return -EFAULT;
267
        }
268
        umap.start = cmap->start;
269
        rc = fb_set_cmap(&umap, info);
270
        fb_dealloc_cmap(&umap);
271
        return rc;
272
}
273
 
274
/**
275
 *      fb_default_cmap - get default colormap
276
 *      @len: size of palette for a depth
277
 *
278
 *      Gets the default colormap for a specific screen depth.  @len
279
 *      is the size of the palette for a particular screen depth.
280
 *
281
 *      Returns pointer to a frame buffer colormap structure.
282
 *
283
 */
284
 
285
const struct fb_cmap *fb_default_cmap(int len)
286
{
287
    if (len <= 2)
288
        return &default_2_colors;
289
    if (len <= 4)
290
        return &default_4_colors;
291
    if (len <= 8)
292
        return &default_8_colors;
293
    return &default_16_colors;
294
}
295
 
296
 
297
/**
298
 *      fb_invert_cmaps - invert all defaults colormaps
299
 *
300
 *      Invert all default colormaps.
301
 *
302
 */
303
 
304
void fb_invert_cmaps(void)
305
{
306
    u_int i;
307
 
308
    for (i = 0; i < ARRAY_SIZE(red2); i++) {
309
        red2[i] = ~red2[i];
310
        green2[i] = ~green2[i];
311
        blue2[i] = ~blue2[i];
312
    }
313
    for (i = 0; i < ARRAY_SIZE(red4); i++) {
314
        red4[i] = ~red4[i];
315
        green4[i] = ~green4[i];
316
        blue4[i] = ~blue4[i];
317
    }
318
    for (i = 0; i < ARRAY_SIZE(red8); i++) {
319
        red8[i] = ~red8[i];
320
        green8[i] = ~green8[i];
321
        blue8[i] = ~blue8[i];
322
    }
323
    for (i = 0; i < ARRAY_SIZE(red16); i++) {
324
        red16[i] = ~red16[i];
325
        green16[i] = ~green16[i];
326
        blue16[i] = ~blue16[i];
327
    }
328
}
329
 
330
 
331
    /*
332
     *  Visible symbols for modules
333
     */
334
 
335
EXPORT_SYMBOL(fb_alloc_cmap);
336
EXPORT_SYMBOL(fb_dealloc_cmap);
337
EXPORT_SYMBOL(fb_copy_cmap);
338
EXPORT_SYMBOL(fb_set_cmap);
339
EXPORT_SYMBOL(fb_default_cmap);
340
EXPORT_SYMBOL(fb_invert_cmaps);

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