media: ov5640: Add Omnivision OV5640 support
[linux-2.6.git] / drivers / video / fbcmap.c
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);