aboutsummaryrefslogtreecommitdiff
path: root/drivers/video/fbcmap.c
blob: c32a2a50bfa2a0870bd69f5c86bbf68a8c81e64d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
/*
 *  linux/drivers/video/fbcmap.c -- Colormap handling for frame buffer devices
 *
 *	Created 15 Jun 1997 by Geert Uytterhoeven
 *
 *	2001 - Documented with DocBook
 *	- Brad Douglas <brad@neruo.com>
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License.  See the file COPYING in the main directory of this archive for
 *  more details.
 */

#include <linux/string.h>
#include <linux/module.h>
#include <linux/tty.h>
#include <linux/fb.h>
#include <linux/slab.h>

#include <asm/uaccess.h>

static u16 red2[] = {
    0x0000, 0xaaaa
};
static u16 green2[] = {
    0x0000, 0xaaaa
};
static u16 blue2[] = {
    0x0000, 0xaaaa
};

static u16 red4[] = {
    0x0000, 0xaaaa, 0x5555, 0xffff
};
static u16 green4[] = {
    0x0000, 0xaaaa, 0x5555, 0xffff
};
static u16 blue4[] = {
    0x0000, 0xaaaa, 0x5555, 0xffff
};

static u16 red8[] = {
    0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa
};
static u16 green8[] = {
    0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa
};
static u16 blue8[] = {
    0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa
};

static u16 red16[] = {
    0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa,
    0x5555, 0x5555, 0x5555, 0x5555, 0xffff, 0xffff, 0xffff, 0xffff
};
static u16 green16[] = {
    0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa,
    0x5555, 0x5555, 0xffff, 0xffff, 0x5555, 0x5555, 0xffff, 0xffff
};
static u16 blue16[] = {
    0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa,
    0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff
};

static struct fb_cmap default_2_colors = {
    0, 2, red2, green2, blue2, NULL
};
static struct fb_cmap default_8_colors = {
    0, 8, red8, green8, blue8, NULL
};
static struct fb_cmap default_4_colors = {
    0, 4, red4, green4, blue4, NULL
};
static struct fb_cmap default_16_colors = {
    0, 16, red16, green16, blue16, NULL
};


/**
 *	fb_alloc_cmap - allocate a colormap
 *	@cmap: frame buffer colormap structure
 *	@len: length of @cmap
 *	@transp: boolean, 1 if there is transparency, 0 otherwise
 *
 *	Allocates memory for a colormap @cmap.  @len is the
 *	number of entries in the palette.
 *
 *	Returns -1 errno on error, or zero on success.
 *
 */

int fb_alloc_cmap(struct fb_cmap *cmap, int len, int transp)
{
    int size = len*sizeof(u16);

    if (cmap->len != len) {
	fb_dealloc_cmap(cmap);
	if (!len)
	    return 0;
	if (!(cmap->red = kmalloc(size, GFP_ATOMIC)))
	    goto fail;
	if (!(cmap->green = kmalloc(size, GFP_ATOMIC)))
	    goto fail;
	if (!(cmap->blue = kmalloc(size, GFP_ATOMIC)))
	    goto fail;
	if (transp) {
	    if (!(cmap->transp = kmalloc(size, GFP_ATOMIC)))
		goto fail;
	} else
	    cmap->transp = NULL;
    }
    cmap->start = 0;
    cmap->len = len;
    fb_copy_cmap(fb_default_cmap(len), cmap);
    return 0;

fail:
    fb_dealloc_cmap(cmap);
    return -1;
}

/**
 *      fb_dealloc_cmap - deallocate a colormap
 *      @cmap: frame buffer colormap structure
 *
 *      Deallocates a colormap that was previously allocated with
 *      fb_alloc_cmap().
 *
 */

void fb_dealloc_cmap(struct fb_cmap *cmap)
{
	kfree(cmap->red);
	kfree(cmap->green);
	kfree(cmap->blue);
	kfree(cmap->transp);

	cmap->red = cmap->green = cmap->blue = cmap->transp = NULL;
	cmap->len = 0;
}

/**
 *	fb_copy_cmap - copy a colormap
 *	@from: frame buffer colormap structure
 *	@to: frame buffer colormap structure
 *
 *	Copy contents of colormap from @from to @to.
 */

int fb_copy_cmap(struct fb_cmap *from, struct fb_cmap *to)
{
	int tooff = 0, fromoff = 0;
	int size;

	if (to->start > from->start)
		fromoff = to->start - from->start;
	else
		tooff = from->start - to->start;
	size = to->len - tooff;
	if (size > (int) (from->len - fromoff))
		size = from->len - fromoff;
	if (size <= 0)
		return -EINVAL;
	size *= sizeof(u16);

	memcpy(to->red+tooff, from->red+fromoff, size);
	memcpy(to->green+tooff, from->green+fromoff, size);
	memcpy(to->blue+tooff, from->blue+fromoff, size);
	if (from->transp && to->transp)
		memcpy(to->transp+tooff, from->transp+fromoff, size);
	return 0;
}

int fb_cmap_to_user(struct fb_cmap *from, struct fb_cmap_user *to)
{
	int tooff = 0, fromoff = 0;
	int size;

	if (to->start > from->start)
		fromoff = to->start - from->start;
	else
		tooff = from->start - to->start;
	size = to->len - tooff;
	if (size > (int) (from->len - fromoff))
		size = from->len - fromoff;
	if (size <= 0)
		return -EINVAL;
	size *= sizeof(u16);

	if (copy_to_user(to->red+tooff, from->red+fromoff, size))
		return -EFAULT;
	if (copy_to_user(to->green+tooff, from->green+fromoff, size))
		return -EFAULT;
	if (copy_to_user(to->blue+tooff, from->blue+fromoff, size))
		return -EFAULT;
	if (from->transp && to->transp)
		if (copy_to_user(to->transp+tooff, from->transp+fromoff, size))
			return -EFAULT;
	return 0;
}

/**
 *	fb_set_cmap - set the colormap
 *	@cmap: frame buffer colormap structure
 *	@info: frame buffer info structure
 *
 *	Sets the colormap @cmap for a screen of device @info.
 *
 *	Returns negative errno on error, or zero on success.
 *
 */

int fb_set_cmap(struct fb_cmap *cmap, struct fb_info *info)
{
	int i, start, rc = 0;
	u16 *red, *green, *blue, *transp;
	u_int hred, hgreen, hblue, htransp = 0xffff;

	red = cmap->red;
	green = cmap->green;
	blue = cmap->blue;
	transp = cmap->transp;
	start = cmap->start;

	if (start < 0 || (!info->fbops->fb_setcolreg &&
			  !info->fbops->fb_setcmap))
		return -EINVAL;
	if (info->fbops->fb_setcmap) {
		rc = info->fbops->fb_setcmap(cmap, info);
	} else {
		for (i = 0; i < cmap->len; i++) {
			hred = *red++;
			hgreen = *green++;
			hblue = *blue++;
			if (transp)
				htransp = *transp++;
			if (info->fbops->fb_setcolreg(start++,
						      hred, hgreen, hblue,
						      htransp, info))
				break;
		}
	}
	if (rc == 0)
		fb_copy_cmap(cmap, &info->cmap);

	return rc;
}

int fb_set_user_cmap(struct fb_cmap_user *cmap, struct fb_info *info)
{
	int rc, size = cmap->len * sizeof(u16);
	struct fb_cmap umap;

	if (cmap->start < 0 || (!info->fbops->fb_setcolreg &&
			        !info->fbops->fb_setcmap))
		return -EINVAL;

	memset(&umap, 0, sizeof(struct fb_cmap));
	rc = fb_alloc_cmap(&umap, cmap->len, cmap->transp != NULL);
	if (rc)
		return rc;
	if (copy_from_user(umap.red, cmap->red, size) ||
	    copy_from_user(umap.green, cmap->green, size) ||
	    copy_from_user(umap.blue, cmap->blue, size) ||
	    (cmap->transp && copy_from_user(umap.transp, cmap->transp, size))) {
		fb_dealloc_cmap(&umap);
		return -EFAULT;
	}
	umap.start = cmap->start;
	rc = fb_set_cmap(&umap, info);
	fb_dealloc_cmap(&umap);
	return rc;
}

/**
 *	fb_default_cmap - get default colormap
 *	@len: size of palette for a depth
 *
 *	Gets the default colormap for a specific screen depth.  @len
 *	is the size of the palette for a particular screen depth.
 *
 *	Returns pointer to a frame buffer colormap structure.
 *
 */

struct fb_cmap *fb_default_cmap(int len)
{
    if (len <= 2)
	return &default_2_colors;
    if (len <= 4)
	return &default_4_colors;
    if (len <= 8)
	return &default_8_colors;
    return &default_16_colors;
}


/**
 *	fb_invert_cmaps - invert all defaults colormaps
 *
 *	Invert all default colormaps.
 *
 */

void fb_invert_cmaps(void)
{
    u_int i;

    for (i = 0; i < 2; i++) {
	red2[i] = ~red2[i];
	green2[i] = ~green2[i];
	blue2[i] = ~blue2[i];
    }
    for (i = 0; i < 4; i++) {
	red4[i] = ~red4[i];
	green4[i] = ~green4[i];
	blue4[i] = ~blue4[i];
    }
    for (i = 0; i < 8; i++) {
	red8[i] = ~red8[i];
	green8[i] = ~green8[i];
	blue8[i] = ~blue8[i];
    }
    for (i = 0; i < 16; i++) {
	red16[i] = ~red16[i];
	green16[i] = ~green16[i];
	blue16[i] = ~blue16[i];
    }
}


    /*
     *  Visible symbols for modules
     */

EXPORT_SYMBOL(fb_alloc_cmap);
EXPORT_SYMBOL(fb_dealloc_cmap);
EXPORT_SYMBOL(fb_copy_cmap);
EXPORT_SYMBOL(fb_set_cmap);
EXPORT_SYMBOL(fb_default_cmap);
EXPORT_SYMBOL(fb_invert_cmaps);