[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini fbset implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
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| 6 | *
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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 8 | *
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| 9 | * This is a from-scratch implementation of fbset; but the de facto fbset
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| 10 | * implementation was a good reference. fbset (original) is released under
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| 11 | * the GPL, and is (c) 1995-1999 by:
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| 12 | * Geert Uytterhoeven (Geert.Uytterhoeven@cs.kuleuven.ac.be)
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| 13 | */
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| 14 |
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| 15 | #include <stdio.h>
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| 16 | #include <stdlib.h>
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| 17 | #include <unistd.h>
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| 18 | #include <fcntl.h>
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| 19 | #include <errno.h>
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| 20 | #include <ctype.h>
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| 21 | #include <string.h>
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| 22 | #include <stdint.h>
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| 23 | #include <sys/ioctl.h>
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| 24 | #include "busybox.h"
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| 25 |
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| 26 | #define DEFAULTFBDEV FB_0
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| 27 | #define DEFAULTFBMODE "/etc/fb.modes"
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| 28 |
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| 29 | enum {
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| 30 | OPT_CHANGE = (1 << 0),
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| 31 | OPT_INFO = (1 << 1),
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| 32 | OPT_READMODE = (1 << 2),
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| 33 |
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| 34 | CMD_FB = 1,
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| 35 | CMD_DB = 2,
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| 36 | CMD_GEOMETRY = 3,
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| 37 | CMD_TIMING = 4,
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| 38 | CMD_ACCEL = 5,
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| 39 | CMD_HSYNC = 6,
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| 40 | CMD_VSYNC = 7,
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| 41 | CMD_LACED = 8,
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| 42 | CMD_DOUBLE = 9,
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| 43 | /* CMD_XCOMPAT = 10, */
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| 44 | CMD_ALL = 11,
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| 45 | CMD_INFO = 12,
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| 46 | CMD_CHANGE = 13,
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| 47 |
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| 48 | #ifdef CONFIG_FEATURE_FBSET_FANCY
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| 49 | CMD_XRES = 100,
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| 50 | CMD_YRES = 101,
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| 51 | CMD_VXRES = 102,
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| 52 | CMD_VYRES = 103,
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| 53 | CMD_DEPTH = 104,
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| 54 | CMD_MATCH = 105,
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| 55 | CMD_PIXCLOCK = 106,
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| 56 | CMD_LEFT = 107,
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| 57 | CMD_RIGHT = 108,
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| 58 | CMD_UPPER = 109,
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| 59 | CMD_LOWER = 110,
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| 60 | CMD_HSLEN = 111,
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| 61 | CMD_VSLEN = 112,
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| 62 | CMD_CSYNC = 113,
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| 63 | CMD_GSYNC = 114,
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| 64 | CMD_EXTSYNC = 115,
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| 65 | CMD_BCAST = 116,
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| 66 | CMD_RGBA = 117,
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| 67 | CMD_STEP = 118,
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| 68 | CMD_MOVE = 119,
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| 69 | #endif
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| 70 | };
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| 71 |
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| 72 | static unsigned int g_options = 0;
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| 73 |
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| 74 | /* Stuff stolen from the kernel's fb.h */
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| 75 | enum {
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| 76 | FBIOGET_VSCREENINFO = 0x4600,
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| 77 | FBIOPUT_VSCREENINFO = 0x4601
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| 78 | };
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| 79 | struct fb_bitfield {
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| 80 | uint32_t offset; /* beginning of bitfield */
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| 81 | uint32_t length; /* length of bitfield */
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| 82 | uint32_t msb_right; /* != 0 : Most significant bit is */
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| 83 | /* right */
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| 84 | };
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| 85 | struct fb_var_screeninfo {
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| 86 | uint32_t xres; /* visible resolution */
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| 87 | uint32_t yres;
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| 88 | uint32_t xres_virtual; /* virtual resolution */
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| 89 | uint32_t yres_virtual;
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| 90 | uint32_t xoffset; /* offset from virtual to visible */
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| 91 | uint32_t yoffset; /* resolution */
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| 92 |
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| 93 | uint32_t bits_per_pixel; /* guess what */
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| 94 | uint32_t grayscale; /* != 0 Graylevels instead of colors */
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| 95 |
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| 96 | struct fb_bitfield red; /* bitfield in fb mem if true color, */
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| 97 | struct fb_bitfield green; /* else only length is significant */
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| 98 | struct fb_bitfield blue;
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| 99 | struct fb_bitfield transp; /* transparency */
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| 100 |
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| 101 | uint32_t nonstd; /* != 0 Non standard pixel format */
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| 102 |
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| 103 | uint32_t activate; /* see FB_ACTIVATE_* */
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| 104 |
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| 105 | uint32_t height; /* height of picture in mm */
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| 106 | uint32_t width; /* width of picture in mm */
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| 107 |
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| 108 | uint32_t accel_flags; /* acceleration flags (hints) */
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| 109 |
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| 110 | /* Timing: All values in pixclocks, except pixclock (of course) */
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| 111 | uint32_t pixclock; /* pixel clock in ps (pico seconds) */
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| 112 | uint32_t left_margin; /* time from sync to picture */
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| 113 | uint32_t right_margin; /* time from picture to sync */
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| 114 | uint32_t upper_margin; /* time from sync to picture */
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| 115 | uint32_t lower_margin;
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| 116 | uint32_t hsync_len; /* length of horizontal sync */
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| 117 | uint32_t vsync_len; /* length of vertical sync */
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| 118 | uint32_t sync; /* see FB_SYNC_* */
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| 119 | uint32_t vmode; /* see FB_VMODE_* */
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| 120 | uint32_t reserved[6]; /* Reserved for future compatibility */
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| 121 | };
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| 122 |
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| 123 |
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| 124 | static const struct cmdoptions_t {
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| 125 | const char *name;
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| 126 | const unsigned char param_count;
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| 127 | const unsigned char code;
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| 128 | } g_cmdoptions[] = {
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| 129 | {
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| 130 | "-fb", 1, CMD_FB}, {
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| 131 | "-db", 1, CMD_DB}, {
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| 132 | "-a", 0, CMD_ALL}, {
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| 133 | "-i", 0, CMD_INFO}, {
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| 134 | "-g", 5, CMD_GEOMETRY}, {
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| 135 | "-t", 7, CMD_TIMING}, {
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| 136 | "-accel", 1, CMD_ACCEL}, {
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| 137 | "-hsync", 1, CMD_HSYNC}, {
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| 138 | "-vsync", 1, CMD_VSYNC}, {
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| 139 | "-laced", 1, CMD_LACED}, {
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| 140 | "-double", 1, CMD_DOUBLE}, {
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| 141 | "-n", 0, CMD_CHANGE}, {
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| 142 | #ifdef CONFIG_FEATURE_FBSET_FANCY
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| 143 | "-all", 0, CMD_ALL}, {
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| 144 | "-xres", 1, CMD_XRES}, {
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| 145 | "-yres", 1, CMD_YRES}, {
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| 146 | "-vxres", 1, CMD_VXRES}, {
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| 147 | "-vyres", 1, CMD_VYRES}, {
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| 148 | "-depth", 1, CMD_DEPTH}, {
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| 149 | "-match", 0, CMD_MATCH}, {
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| 150 | "-geometry", 5, CMD_GEOMETRY}, {
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| 151 | "-pixclock", 1, CMD_PIXCLOCK}, {
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| 152 | "-left", 1, CMD_LEFT}, {
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| 153 | "-right", 1, CMD_RIGHT}, {
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| 154 | "-upper", 1, CMD_UPPER}, {
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| 155 | "-lower", 1, CMD_LOWER}, {
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| 156 | "-hslen", 1, CMD_HSLEN}, {
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| 157 | "-vslen", 1, CMD_VSLEN}, {
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| 158 | "-timings", 7, CMD_TIMING}, {
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| 159 | "-csync", 1, CMD_CSYNC}, {
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| 160 | "-gsync", 1, CMD_GSYNC}, {
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| 161 | "-extsync", 1, CMD_EXTSYNC}, {
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| 162 | "-bcast", 1, CMD_BCAST}, {
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| 163 | "-rgba", 1, CMD_RGBA}, {
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| 164 | "-step", 1, CMD_STEP}, {
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| 165 | "-move", 1, CMD_MOVE}, {
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| 166 | #endif
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| 167 | 0, 0, 0}
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| 168 | };
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| 169 |
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| 170 | #ifdef CONFIG_FEATURE_FBSET_READMODE
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| 171 | /* taken from linux/fb.h */
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| 172 | enum {
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| 173 | FB_VMODE_INTERLACED = 1, /* interlaced */
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| 174 | FB_VMODE_DOUBLE = 2, /* double scan */
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| 175 | FB_SYNC_HOR_HIGH_ACT = 1, /* horizontal sync high active */
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| 176 | FB_SYNC_VERT_HIGH_ACT = 2, /* vertical sync high active */
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| 177 | FB_SYNC_EXT = 4, /* external sync */
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| 178 | FB_SYNC_COMP_HIGH_ACT = 8 /* composite sync high active */
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| 179 | };
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| 180 | #endif
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| 181 | static int readmode(struct fb_var_screeninfo *base, const char *fn,
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| 182 | const char *mode)
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| 183 | {
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| 184 | #ifdef CONFIG_FEATURE_FBSET_READMODE
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| 185 | FILE *f;
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| 186 | char buf[256];
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| 187 | char *p = buf;
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| 188 |
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| 189 | f = bb_xfopen(fn, "r");
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| 190 | while (!feof(f)) {
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| 191 | fgets(buf, sizeof(buf), f);
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| 192 | if ((p = strstr(buf, "mode ")) || (p = strstr(buf, "mode\t"))) {
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| 193 | p += 5;
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| 194 | if ((p = strstr(buf, mode))) {
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| 195 | p += strlen(mode);
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| 196 | if (!isspace(*p) && (*p != 0) && (*p != '"')
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| 197 | && (*p != '\r') && (*p != '\n'))
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| 198 | continue; /* almost, but not quite */
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| 199 | while (!feof(f)) {
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| 200 | fgets(buf, sizeof(buf), f);
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| 201 |
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| 202 | if ((p = strstr(buf, "geometry "))) {
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| 203 | p += 9;
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| 204 |
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| 205 | sscanf(p, "%d %d %d %d %d",
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| 206 | &(base->xres), &(base->yres),
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| 207 | &(base->xres_virtual), &(base->yres_virtual),
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| 208 | &(base->bits_per_pixel));
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| 209 | } else if ((p = strstr(buf, "timings "))) {
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| 210 | p += 8;
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| 211 |
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| 212 | sscanf(p, "%d %d %d %d %d %d %d",
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| 213 | &(base->pixclock),
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| 214 | &(base->left_margin), &(base->right_margin),
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| 215 | &(base->upper_margin), &(base->lower_margin),
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| 216 | &(base->hsync_len), &(base->vsync_len));
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| 217 | } else if ((p = strstr(buf, "laced "))) {
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| 218 | p += 6;
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| 219 |
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| 220 | if (strstr(buf, "false")) {
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| 221 | base->vmode &= ~FB_VMODE_INTERLACED;
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| 222 | } else {
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| 223 | base->vmode |= FB_VMODE_INTERLACED;
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| 224 | }
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| 225 | } else if ((p = strstr(buf, "double "))) {
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| 226 | p += 7;
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| 227 |
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| 228 | if (strstr(buf, "false")) {
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| 229 | base->vmode &= ~FB_VMODE_DOUBLE;
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| 230 | } else {
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| 231 | base->vmode |= FB_VMODE_DOUBLE;
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| 232 | }
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| 233 | } else if ((p = strstr(buf, "vsync "))) {
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| 234 | p += 6;
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| 235 |
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| 236 | if (strstr(buf, "low")) {
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| 237 | base->sync &= ~FB_SYNC_VERT_HIGH_ACT;
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| 238 | } else {
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| 239 | base->sync |= FB_SYNC_VERT_HIGH_ACT;
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| 240 | }
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| 241 | } else if ((p = strstr(buf, "hsync "))) {
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| 242 | p += 6;
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| 243 |
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| 244 | if (strstr(buf, "low")) {
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| 245 | base->sync &= ~FB_SYNC_HOR_HIGH_ACT;
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| 246 | } else {
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| 247 | base->sync |= FB_SYNC_HOR_HIGH_ACT;
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| 248 | }
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| 249 | } else if ((p = strstr(buf, "csync "))) {
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| 250 | p += 6;
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| 251 |
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| 252 | if (strstr(buf, "low")) {
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| 253 | base->sync &= ~FB_SYNC_COMP_HIGH_ACT;
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| 254 | } else {
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| 255 | base->sync |= FB_SYNC_COMP_HIGH_ACT;
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| 256 | }
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| 257 | } else if ((p = strstr(buf, "extsync "))) {
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| 258 | p += 8;
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| 259 |
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| 260 | if (strstr(buf, "false")) {
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| 261 | base->sync &= ~FB_SYNC_EXT;
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| 262 | } else {
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| 263 | base->sync |= FB_SYNC_EXT;
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| 264 | }
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| 265 | }
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| 266 |
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| 267 | if (strstr(buf, "endmode"))
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| 268 | return 1;
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| 269 | }
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| 270 | }
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| 271 | }
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| 272 | }
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| 273 | #else
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| 274 | bb_error_msg( "mode reading not compiled in");
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| 275 | #endif
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| 276 | return 0;
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| 277 | }
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| 278 |
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| 279 | static inline void setmode(struct fb_var_screeninfo *base,
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| 280 | struct fb_var_screeninfo *set)
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| 281 | {
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| 282 | if ((int) set->xres > 0)
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| 283 | base->xres = set->xres;
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| 284 | if ((int) set->yres > 0)
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| 285 | base->yres = set->yres;
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| 286 | if ((int) set->xres_virtual > 0)
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| 287 | base->xres_virtual = set->xres_virtual;
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| 288 | if ((int) set->yres_virtual > 0)
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| 289 | base->yres_virtual = set->yres_virtual;
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| 290 | if ((int) set->bits_per_pixel > 0)
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| 291 | base->bits_per_pixel = set->bits_per_pixel;
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| 292 | }
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| 293 |
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| 294 | static inline void showmode(struct fb_var_screeninfo *v)
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| 295 | {
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| 296 | double drate = 0, hrate = 0, vrate = 0;
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| 297 |
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| 298 | if (v->pixclock) {
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| 299 | drate = 1e12 / v->pixclock;
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| 300 | hrate =
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| 301 | drate / (v->left_margin + v->xres + v->right_margin +
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| 302 | v->hsync_len);
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| 303 | vrate =
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| 304 | hrate / (v->upper_margin + v->yres + v->lower_margin +
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| 305 | v->vsync_len);
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| 306 | }
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| 307 | printf("\nmode \"%ux%u-%u\"\n"
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| 308 | #ifdef CONFIG_FEATURE_FBSET_FANCY
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| 309 | "\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n"
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| 310 | #endif
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| 311 | "\tgeometry %u %u %u %u %u\n\ttimings %u %u %u %u %u %u %u\n\taccel %s\n\trgba %u/%u,%u/%u,%u/%u,%u/%u\nendmode\n\n",
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| 312 | v->xres, v->yres, (int) (vrate + 0.5),
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| 313 | #ifdef CONFIG_FEATURE_FBSET_FANCY
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| 314 | drate / 1e6, hrate / 1e3, vrate,
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| 315 | #endif
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| 316 | v->xres, v->yres, v->xres_virtual, v->yres_virtual,
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| 317 | v->bits_per_pixel, v->pixclock, v->left_margin,
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| 318 | v->right_margin, v->upper_margin, v->lower_margin, v->hsync_len,
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| 319 | v->vsync_len, (v->accel_flags > 0 ? "true" : "false"), v->red.length,
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| 320 | v->red.offset, v->green.length, v->green.offset, v->blue.length,
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| 321 | v->blue.offset, v->transp.length, v->transp.offset);
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| 322 | }
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| 323 |
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| 324 | #ifdef STANDALONE
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| 325 | int main(int argc, char **argv)
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| 326 | #else
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| 327 | int fbset_main(int argc, char **argv)
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| 328 | #endif
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| 329 | {
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| 330 | struct fb_var_screeninfo var, varset;
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| 331 | int fh, i;
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| 332 | char *fbdev = DEFAULTFBDEV;
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| 333 | char *modefile = DEFAULTFBMODE;
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| 334 | char *thisarg, *mode = NULL;
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| 335 |
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| 336 | memset(&varset, 0xFF, sizeof(varset));
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| 337 |
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| 338 | /* parse cmd args.... why do they have to make things so difficult? */
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| 339 | argv++;
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| 340 | argc--;
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| 341 | for (; argc > 0 && (thisarg = *argv); argc--, argv++) {
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| 342 | for (i = 0; g_cmdoptions[i].name; i++) {
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| 343 | if (!strcmp(thisarg, g_cmdoptions[i].name)) {
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| 344 | if (argc - 1 < g_cmdoptions[i].param_count)
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| 345 | bb_show_usage();
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| 346 | switch (g_cmdoptions[i].code) {
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| 347 | case CMD_FB:
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| 348 | fbdev = argv[1];
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| 349 | break;
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| 350 | case CMD_DB:
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| 351 | modefile = argv[1];
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| 352 | break;
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| 353 | case CMD_GEOMETRY:
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| 354 | varset.xres = strtoul(argv[1], 0, 0);
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| 355 | varset.yres = strtoul(argv[2], 0, 0);
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| 356 | varset.xres_virtual = strtoul(argv[3], 0, 0);
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| 357 | varset.yres_virtual = strtoul(argv[4], 0, 0);
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| 358 | varset.bits_per_pixel = strtoul(argv[5], 0, 0);
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| 359 | break;
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| 360 | case CMD_TIMING:
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| 361 | varset.pixclock = strtoul(argv[1], 0, 0);
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| 362 | varset.left_margin = strtoul(argv[2], 0, 0);
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| 363 | varset.right_margin = strtoul(argv[3], 0, 0);
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| 364 | varset.upper_margin = strtoul(argv[4], 0, 0);
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| 365 | varset.lower_margin = strtoul(argv[5], 0, 0);
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| 366 | varset.hsync_len = strtoul(argv[6], 0, 0);
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| 367 | varset.vsync_len = strtoul(argv[7], 0, 0);
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| 368 | break;
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| 369 | case CMD_CHANGE:
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| 370 | g_options |= OPT_CHANGE;
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| 371 | break;
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| 372 | #ifdef CONFIG_FEATURE_FBSET_FANCY
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| 373 | case CMD_XRES:
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| 374 | varset.xres = strtoul(argv[1], 0, 0);
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| 375 | break;
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| 376 | case CMD_YRES:
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| 377 | varset.yres = strtoul(argv[1], 0, 0);
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| 378 | break;
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| 379 | case CMD_DEPTH:
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| 380 | varset.bits_per_pixel = strtoul(argv[1], 0, 0);
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| 381 | break;
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| 382 | #endif
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| 383 | }
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| 384 | argc -= g_cmdoptions[i].param_count;
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| 385 | argv += g_cmdoptions[i].param_count;
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| 386 | break;
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| 387 | }
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| 388 | }
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| 389 | if (!g_cmdoptions[i].name) {
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| 390 | if (argc == 1) {
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| 391 | mode = *argv;
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| 392 | g_options |= OPT_READMODE;
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| 393 | } else {
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| 394 | bb_show_usage();
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| 395 | }
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| 396 | }
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| 397 | }
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| 398 |
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| 399 | fh = bb_xopen(fbdev, O_RDONLY);
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| 400 | if (ioctl(fh, FBIOGET_VSCREENINFO, &var))
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| 401 | bb_perror_msg_and_die("fbset(ioctl)");
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| 402 | if (g_options & OPT_READMODE) {
|
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| 403 | if (!readmode(&var, modefile, mode)) {
|
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| 404 | bb_error_msg("Unknown video mode `%s'", mode);
|
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| 405 | return EXIT_FAILURE;
|
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| 406 | }
|
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| 407 | }
|
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| 408 |
|
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| 409 | setmode(&var, &varset);
|
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| 410 | if (g_options & OPT_CHANGE)
|
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| 411 | if (ioctl(fh, FBIOPUT_VSCREENINFO, &var))
|
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| 412 | bb_perror_msg_and_die("fbset(ioctl)");
|
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| 413 | showmode(&var);
|
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| 414 | /* Don't close the file, as exiting will take care of that */
|
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| 415 | /* close(fh); */
|
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| 416 |
|
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| 417 | return EXIT_SUCCESS;
|
---|
| 418 | }
|
---|