Linux preempt-rt

Check our new training course

Real-Time Linux with PREEMPT_RT

Check our new training course
with Creative Commons CC-BY-SA
lecture and lab materials

Bootlin logo

Elixir Cross Referencer

  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
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
/* vi: set sw=4 ts=4: */
/*
 * Mini fbset implementation for busybox
 *
 * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * This is a from-scratch implementation of fbset; but the de facto fbset
 * implementation was a good reference. fbset (original) is released under
 * the GPL, and is (c) 1995-1999 by: 
 *     Geert Uytterhoeven (Geert.Uytterhoeven@cs.kuleuven.ac.be)
 */

#include "busybox.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <string.h>
#include <sys/ioctl.h>

#define DEFAULTFBDEV  "/dev/fb0"
#define DEFAULTFBMODE "/etc/fb.modes"

static const int OPT_CHANGE   = (1 << 0);
static const int OPT_INFO     = (1 << 1);
static const int OPT_READMODE = (1 << 2);

enum {
	CMD_HELP = 0,
	CMD_FB = 1,
	CMD_DB = 2,
	CMD_GEOMETRY = 3,
	CMD_TIMING = 4,
	CMD_ACCEL = 5,
	CMD_HSYNC = 6,
	CMD_VSYNC = 7,
	CMD_LACED = 8,
	CMD_DOUBLE = 9,
/* 	CMD_XCOMPAT =     10, */
	CMD_ALL = 11,
	CMD_INFO = 12,
	CMD_CHANGE = 13,

#ifdef BB_FEATURE_FBSET_FANCY
	CMD_XRES = 100,
	CMD_YRES = 101,
	CMD_VXRES = 102,
	CMD_VYRES = 103,
	CMD_DEPTH = 104,
	CMD_MATCH = 105,
	CMD_PIXCLOCK = 106,
	CMD_LEFT = 107,
	CMD_RIGHT = 108,
	CMD_UPPER = 109,
	CMD_LOWER = 110,
	CMD_HSLEN = 111,
	CMD_VSLEN = 112,
	CMD_CSYNC = 113,
	CMD_GSYNC = 114,
	CMD_EXTSYNC = 115,
	CMD_BCAST = 116,
	CMD_RGBA = 117,
	CMD_STEP = 118,
	CMD_MOVE = 119,
#endif
};

static unsigned int g_options = 0;

/* Stuff stolen from the kernel's fb.h */
static const int FBIOGET_VSCREENINFO = 0x4600;
static const int FBIOPUT_VSCREENINFO = 0x4601;
#define __u32			unsigned int
struct fb_bitfield {
	__u32 offset;			/* beginning of bitfield	*/
	__u32 length;			/* length of bitfield		*/
	__u32 msb_right;		/* != 0 : Most significant bit is */ 
					/* right */ 
};
struct fb_var_screeninfo {
	__u32 xres;			/* visible resolution		*/
	__u32 yres;
	__u32 xres_virtual;		/* virtual resolution		*/
	__u32 yres_virtual;
	__u32 xoffset;			/* offset from virtual to visible */
	__u32 yoffset;			/* resolution			*/

	__u32 bits_per_pixel;		/* guess what			*/
	__u32 grayscale;		/* != 0 Graylevels instead of colors */

	struct fb_bitfield red;		/* bitfield in fb mem if true color, */
	struct fb_bitfield green;	/* else only length is significant */
	struct fb_bitfield blue;
	struct fb_bitfield transp;	/* transparency			*/	

	__u32 nonstd;			/* != 0 Non standard pixel format */

	__u32 activate;			/* see FB_ACTIVATE_*		*/

	__u32 height;			/* height of picture in mm    */
	__u32 width;			/* width of picture in mm     */

	__u32 accel_flags;		/* acceleration flags (hints)	*/

	/* Timing: All values in pixclocks, except pixclock (of course) */
	__u32 pixclock;			/* pixel clock in ps (pico seconds) */
	__u32 left_margin;		/* time from sync to picture	*/
	__u32 right_margin;		/* time from picture to sync	*/
	__u32 upper_margin;		/* time from sync to picture	*/
	__u32 lower_margin;
	__u32 hsync_len;		/* length of horizontal sync	*/
	__u32 vsync_len;		/* length of vertical sync	*/
	__u32 sync;			/* see FB_SYNC_*		*/
	__u32 vmode;			/* see FB_VMODE_*		*/
	__u32 reserved[6];		/* Reserved for future compatibility */
};


struct cmdoptions_t {
	char *name;
	unsigned char param_count;
	unsigned char code;
} g_cmdoptions[] = {
	{
	"-h", 0, CMD_HELP}, {
	"-fb", 1, CMD_FB}, {
	"-db", 1, CMD_DB}, {
	"-a", 0, CMD_ALL}, {
	"-i", 0, CMD_INFO}, {
	"-g", 5, CMD_GEOMETRY}, {
	"-t", 7, CMD_TIMING}, {
	"-accel", 1, CMD_ACCEL}, {
	"-hsync", 1, CMD_HSYNC}, {
	"-vsync", 1, CMD_VSYNC}, {
	"-laced", 1, CMD_LACED}, {
	"-double", 1, CMD_DOUBLE}, {
	"-help", 0, CMD_HELP}, {
	"-n", 0, CMD_CHANGE}, {
#ifdef BB_FEATURE_FBSET_FANCY
	"-help", 0, CMD_HELP}, {
	"-all", 0, CMD_ALL}, {
	"-xres", 1, CMD_XRES}, {
	"-yres", 1, CMD_YRES}, {
	"-vxres", 1, CMD_VXRES}, {
	"-vyres", 1, CMD_VYRES}, {
	"-depth", 1, CMD_DEPTH}, {
	"-match", 0, CMD_MATCH}, {
	"-geometry", 5, CMD_GEOMETRY}, {
	"-pixclock", 1, CMD_PIXCLOCK}, {
	"-left", 1, CMD_LEFT}, {
	"-right", 1, CMD_RIGHT}, {
	"-upper", 1, CMD_UPPER}, {
	"-lower", 1, CMD_LOWER}, {
	"-hslen", 1, CMD_HSLEN}, {
	"-vslen", 1, CMD_VSLEN}, {
	"-timings", 7, CMD_TIMING}, {
	"-csync", 1, CMD_CSYNC}, {
	"-gsync", 1, CMD_GSYNC}, {
	"-extsync", 1, CMD_EXTSYNC}, {
	"-bcast", 1, CMD_BCAST}, {
	"-rgba", 1, CMD_RGBA}, {
	"-step", 1, CMD_STEP}, {
	"-move", 1, CMD_MOVE}, {
#endif
	0, 0, 0}
};

#ifdef BB_FEATURE_FBSET_READMODE
/* taken from linux/fb.h */
static const int FB_VMODE_INTERLACED = 1;	/* interlaced	*/
static const int FB_VMODE_DOUBLE = 2;	/* double scan */
static const int FB_SYNC_HOR_HIGH_ACT = 1;	/* horizontal sync high active	*/
static const int FB_SYNC_VERT_HIGH_ACT = 2;	/* vertical sync high active	*/
static const int FB_SYNC_EXT = 4;	/* external sync		*/
static const int FB_SYNC_COMP_HIGH_ACT = 8;	/* composite sync high active   */
#endif
static int readmode(struct fb_var_screeninfo *base, const char *fn,
					const char *mode)
{
#ifdef BB_FEATURE_FBSET_READMODE
	FILE *f;
	char buf[256];
	char *p = buf;

	if ((f = fopen(fn, "r")) == NULL)
		perror_msg_and_die("readmode(fopen)");
	while (!feof(f)) {
		fgets(buf, sizeof(buf), f);
		if ((p = strstr(buf, "mode ")) || (p = strstr(buf, "mode\t"))) {
			p += 5;
			if ((p = strstr(buf, mode))) {
				p += strlen(mode);
				if (!isspace(*p) && (*p != 0) && (*p != '"')
					&& (*p != '\r') && (*p != '\n'))
					continue;	/* almost, but not quite */
				while (!feof(f)) {
					fgets(buf, sizeof(buf), f);

                    if ((p = strstr(buf, "geometry "))) {
                        p += 9;

                        sscanf(p, "%d %d %d %d %d", 
                                &(base->xres), &(base->yres), 
                                &(base->xres_virtual), &(base->yres_virtual), 
                                &(base->bits_per_pixel));
                    } else if ((p = strstr(buf, "timings "))) {
                        p += 8;
                        
                        sscanf(p, "%d %d %d %d %d %d %d",
                                &(base->pixclock),
                                &(base->left_margin), &(base->right_margin),
                                &(base->upper_margin), &(base->lower_margin),
                                &(base->hsync_len), &(base->vsync_len));
                    } else if ((p = strstr(buf, "laced "))) {
                        p += 6;

                        if (strstr(buf, "false")) {
                            base->vmode &= ~FB_VMODE_INTERLACED;
                        } else {
                            base->vmode |= FB_VMODE_INTERLACED;
                        }
                    } else if ((p = strstr(buf, "double "))) {
                        p += 7;

                        if (strstr(buf, "false")) {
                            base->vmode &= ~FB_VMODE_DOUBLE;
                        } else {
                            base->vmode |= FB_VMODE_DOUBLE;
                        }
                    } else if ((p = strstr(buf, "vsync "))) {
                        p += 6;

                        if (strstr(buf, "low")) {
                            base->sync &= ~FB_SYNC_VERT_HIGH_ACT;
                        } else {
                            base->sync |= FB_SYNC_VERT_HIGH_ACT;
                        }
                    } else if ((p = strstr(buf, "hsync "))) {
                        p += 6;

                        if (strstr(buf, "low")) {
                            base->sync &= ~FB_SYNC_HOR_HIGH_ACT;
                        } else {
                            base->sync |= FB_SYNC_HOR_HIGH_ACT;
                        }
                    } else if ((p = strstr(buf, "csync "))) {
                        p += 6;

                        if (strstr(buf, "low")) {
                            base->sync &= ~FB_SYNC_COMP_HIGH_ACT;
                        } else {
                            base->sync |= FB_SYNC_COMP_HIGH_ACT;
                        }
                    } else if ((p = strstr(buf, "extsync "))) {
                        p += 8;

                        if (strstr(buf, "false")) {
                            base->sync &= ~FB_SYNC_EXT;
                        } else {
                            base->sync |= FB_SYNC_EXT;
                        }
                    }
                    
					if (strstr(buf, "endmode"))
						return 1;
				}
			}
		}
	}
#else
	error_msg( "mode reading not compiled in\n");
#endif
	return 0;
}

static void setmode(struct fb_var_screeninfo *base,
					struct fb_var_screeninfo *set)
{
	if ((int) set->xres > 0)
		base->xres = set->xres;
	if ((int) set->yres > 0)
		base->yres = set->yres;
	if ((int) set->xres_virtual > 0)
		base->xres_virtual = set->xres_virtual;
	if ((int) set->yres_virtual > 0)
		base->yres_virtual = set->yres_virtual;
	if ((int) set->bits_per_pixel > 0)
		base->bits_per_pixel = set->bits_per_pixel;
}

static void showmode(struct fb_var_screeninfo *v)
{
	double drate = 0, hrate = 0, vrate = 0;

	if (v->pixclock) {
		drate = 1e12 / v->pixclock;
		hrate =
			drate / (v->left_margin + v->xres + v->right_margin +
					 v->hsync_len);
		vrate =
			hrate / (v->upper_margin + v->yres + v->lower_margin +
					 v->vsync_len);
	}
	printf("\nmode \"%ux%u-%u\"\n", v->xres, v->yres, (int) (vrate + 0.5));
#ifdef BB_FEATURE_FBSET_FANCY
	printf("\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n", drate / 1e6,
		   hrate / 1e3, vrate);
#endif
	printf("\tgeometry %u %u %u %u %u\n", v->xres, v->yres,
		   v->xres_virtual, v->yres_virtual, v->bits_per_pixel);
	printf("\ttimings %u %u %u %u %u %u %u\n", v->pixclock, v->left_margin,
		   v->right_margin, v->upper_margin, v->lower_margin, v->hsync_len,
		   v->vsync_len);
	printf("\taccel %s\n", (v->accel_flags > 0 ? "true" : "false"));
	printf("\trgba %u/%u,%u/%u,%u/%u,%u/%u\n", v->red.length,
		   v->red.offset, v->green.length, v->green.offset, v->blue.length,
		   v->blue.offset, v->transp.length, v->transp.offset);
	printf("endmode\n\n");
}

static void fbset_usage(void)
{
#ifndef BB_FEATURE_TRIVIAL_HELP
	int i;
#endif

#ifndef STANDALONE
	fprintf(stderr, "BusyBox v%s (%s) multi-call binary -- GPL2\n\n",
			BB_VER, BB_BT);
#endif
	fprintf(stderr, "Usage: fbset [options] [mode]\n");
#ifndef BB_FEATURE_TRIVIAL_HELP
	fprintf(stderr, "\nShows and modifies frame buffer device settings\n\n");
	fprintf(stderr, "The following options are recognized:\n");
	for (i = 0; g_cmdoptions[i].name; i++)
		fprintf(stderr, "\t%s\n", g_cmdoptions[i].name);
#endif
	exit(-1);
}

#ifdef STANDALONE
int main(int argc, char **argv)
#else
extern int fbset_main(int argc, char **argv)
#endif
{
	struct fb_var_screeninfo var, varset;
	int fh, i;
	char *fbdev = DEFAULTFBDEV;
	char *modefile = DEFAULTFBMODE;
	char *thisarg, *mode = NULL;

	memset(&varset, 0xFF, sizeof(varset));

	/* parse cmd args.... why do they have to make things so difficult? */
	argv++;
	argc--;
	for (; argc > 0 && (thisarg = *argv); argc--, argv++) {
		for (i = 0; g_cmdoptions[i].name; i++) {
			if (!strcmp(thisarg, g_cmdoptions[i].name)) {
				if (argc - 1 < g_cmdoptions[i].param_count)
					fbset_usage();
				switch (g_cmdoptions[i].code) {
				case CMD_HELP:
					fbset_usage();
				case CMD_FB:
					fbdev = argv[1];
					break;
				case CMD_DB:
					modefile = argv[1];
					break;
				case CMD_GEOMETRY:
					varset.xres = strtoul(argv[1], 0, 0);
					varset.yres = strtoul(argv[2], 0, 0);
					varset.xres_virtual = strtoul(argv[3], 0, 0);
					varset.yres_virtual = strtoul(argv[4], 0, 0);
					varset.bits_per_pixel = strtoul(argv[5], 0, 0);
					break;
				case CMD_TIMING:
					varset.pixclock = strtoul(argv[1], 0, 0);
					varset.left_margin = strtoul(argv[2], 0, 0);
					varset.right_margin = strtoul(argv[3], 0, 0);
					varset.upper_margin = strtoul(argv[4], 0, 0);
					varset.lower_margin = strtoul(argv[5], 0, 0);
					varset.hsync_len = strtoul(argv[6], 0, 0);
					varset.vsync_len = strtoul(argv[7], 0, 0);
					break;
                case CMD_CHANGE:
                    g_options |= OPT_CHANGE;
                    break;
#ifdef BB_FEATURE_FBSET_FANCY
				case CMD_XRES:
					varset.xres = strtoul(argv[1], 0, 0);
					break;
				case CMD_YRES:
					varset.yres = strtoul(argv[1], 0, 0);
					break;
#endif
				}
				argc -= g_cmdoptions[i].param_count;
				argv += g_cmdoptions[i].param_count;
				break;
			}
		}
		if (!g_cmdoptions[i].name) {
			if (argc == 1) {
				mode = *argv;
				g_options |= OPT_READMODE;
			} else {
				fbset_usage();
			}
		}
	}

	if ((fh = open(fbdev, O_RDONLY)) < 0)
		perror_msg_and_die("fbset(open)");
	if (ioctl(fh, FBIOGET_VSCREENINFO, &var))
		perror_msg_and_die("fbset(ioctl)");
	if (g_options & OPT_READMODE) {
		if (!readmode(&var, modefile, mode)) {
			error_msg("Unknown video mode `%s'\n", mode);
			return EXIT_FAILURE;
		}
	}

	setmode(&var, &varset);
	if (g_options & OPT_CHANGE)
		if (ioctl(fh, FBIOPUT_VSCREENINFO, &var))
			perror_msg_and_die("fbset(ioctl)");
	showmode(&var);
	/* Don't close the file, as exiting will take care of that */
	/* close(fh); */

	return EXIT_SUCCESS;
}