492 lines
14 KiB
C
492 lines
14 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini fbset implementation for busybox
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*
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* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*
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* This is a from-scratch implementation of fbset; but the de facto fbset
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* implementation was a good reference. fbset (original) is released under
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* the GPL, and is (c) 1995-1999 by:
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* Geert Uytterhoeven (Geert.Uytterhoeven@cs.kuleuven.ac.be)
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*/
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#include "libbb.h"
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#define DEFAULTFBDEV FB_0
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#define DEFAULTFBMODE "/etc/fb.modes"
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/* Stuff stolen from the kernel's fb.h */
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#define FB_ACTIVATE_ALL 64
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enum {
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FBIOGET_VSCREENINFO = 0x4600,
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FBIOPUT_VSCREENINFO = 0x4601
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};
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struct fb_bitfield {
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uint32_t offset; /* beginning of bitfield */
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uint32_t length; /* length of bitfield */
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uint32_t msb_right; /* !=0: Most significant bit is right */
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};
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struct fb_var_screeninfo {
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uint32_t xres; /* visible resolution */
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uint32_t yres;
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uint32_t xres_virtual; /* virtual resolution */
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uint32_t yres_virtual;
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uint32_t xoffset; /* offset from virtual to visible */
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uint32_t yoffset; /* resolution */
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uint32_t bits_per_pixel;
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uint32_t grayscale; /* !=0 Graylevels instead of colors */
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struct fb_bitfield red; /* bitfield in fb mem if true color, */
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struct fb_bitfield green; /* else only length is significant */
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struct fb_bitfield blue;
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struct fb_bitfield transp; /* transparency */
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uint32_t nonstd; /* !=0 Non standard pixel format */
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uint32_t activate; /* see FB_ACTIVATE_x */
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uint32_t height; /* height of picture in mm */
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uint32_t width; /* width of picture in mm */
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uint32_t accel_flags; /* acceleration flags (hints) */
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/* Timing: All values in pixclocks, except pixclock (of course) */
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uint32_t pixclock; /* pixel clock in ps (pico seconds) */
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uint32_t left_margin; /* time from sync to picture */
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uint32_t right_margin; /* time from picture to sync */
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uint32_t upper_margin; /* time from sync to picture */
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uint32_t lower_margin;
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uint32_t hsync_len; /* length of horizontal sync */
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uint32_t vsync_len; /* length of vertical sync */
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uint32_t sync; /* see FB_SYNC_x */
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uint32_t vmode; /* see FB_VMODE_x */
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uint32_t reserved[6]; /* Reserved for future compatibility */
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};
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static void copy_if_gt0(uint32_t *src, uint32_t *dst, unsigned cnt)
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{
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do {
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if ((int32_t) *src > 0)
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*dst = *src;
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src++;
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dst++;
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} while (--cnt);
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}
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static NOINLINE void copy_changed_values(
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struct fb_var_screeninfo *base,
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struct fb_var_screeninfo *set)
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{
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//if ((int32_t) set->xres > 0) base->xres = set->xres;
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//if ((int32_t) set->yres > 0) base->yres = set->yres;
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//if ((int32_t) set->xres_virtual > 0) base->xres_virtual = set->xres_virtual;
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//if ((int32_t) set->yres_virtual > 0) base->yres_virtual = set->yres_virtual;
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copy_if_gt0(&set->xres, &base->xres, 4);
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if ((int32_t) set->bits_per_pixel > 0) base->bits_per_pixel = set->bits_per_pixel;
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//copy_if_gt0(&set->bits_per_pixel, &base->bits_per_pixel, 1);
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//if ((int32_t) set->pixclock > 0) base->pixclock = set->pixclock;
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//if ((int32_t) set->left_margin > 0) base->left_margin = set->left_margin;
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//if ((int32_t) set->right_margin > 0) base->right_margin = set->right_margin;
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//if ((int32_t) set->upper_margin > 0) base->upper_margin = set->upper_margin;
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//if ((int32_t) set->lower_margin > 0) base->lower_margin = set->lower_margin;
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//if ((int32_t) set->hsync_len > 0) base->hsync_len = set->hsync_len;
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//if ((int32_t) set->vsync_len > 0) base->vsync_len = set->vsync_len;
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//if ((int32_t) set->sync > 0) base->sync = set->sync;
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//if ((int32_t) set->vmode > 0) base->vmode = set->vmode;
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copy_if_gt0(&set->pixclock, &base->pixclock, 9);
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}
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enum {
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CMD_FB = 1,
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CMD_DB = 2,
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CMD_GEOMETRY = 3,
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CMD_TIMING = 4,
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CMD_ACCEL = 5,
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CMD_HSYNC = 6,
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CMD_VSYNC = 7,
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CMD_LACED = 8,
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CMD_DOUBLE = 9,
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/* CMD_XCOMPAT = 10, */
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CMD_ALL = 11,
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CMD_INFO = 12,
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CMD_SHOW = 13,
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CMD_CHANGE = 14,
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#if ENABLE_FEATURE_FBSET_FANCY
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CMD_XRES = 100,
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CMD_YRES = 101,
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CMD_VXRES = 102,
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CMD_VYRES = 103,
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CMD_DEPTH = 104,
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CMD_MATCH = 105,
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CMD_PIXCLOCK = 106,
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CMD_LEFT = 107,
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CMD_RIGHT = 108,
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CMD_UPPER = 109,
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CMD_LOWER = 110,
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CMD_HSLEN = 111,
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CMD_VSLEN = 112,
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CMD_CSYNC = 113,
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CMD_GSYNC = 114,
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CMD_EXTSYNC = 115,
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CMD_BCAST = 116,
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CMD_RGBA = 117,
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CMD_STEP = 118,
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CMD_MOVE = 119,
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#endif
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};
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static const struct cmdoptions_t {
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const char name[9];
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const unsigned char param_count;
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const unsigned char code;
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} g_cmdoptions[] = {
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/*"12345678" + NUL */
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{ "fb" , 1, CMD_FB },
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{ "db" , 1, CMD_DB },
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{ "a" , 0, CMD_ALL },
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{ "i" , 0, CMD_INFO },
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{ "g" , 5, CMD_GEOMETRY },
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{ "t" , 7, CMD_TIMING },
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{ "accel" , 1, CMD_ACCEL },
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{ "hsync" , 1, CMD_HSYNC },
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{ "vsync" , 1, CMD_VSYNC },
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{ "laced" , 1, CMD_LACED },
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{ "double" , 1, CMD_DOUBLE },
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{ "show" , 0, CMD_SHOW },
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{ "s" , 0, CMD_SHOW },
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#if ENABLE_FEATURE_FBSET_FANCY
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{ "all" , 0, CMD_ALL },
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{ "xres" , 1, CMD_XRES },
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{ "yres" , 1, CMD_YRES },
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{ "vxres" , 1, CMD_VXRES },
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{ "vyres" , 1, CMD_VYRES },
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{ "depth" , 1, CMD_DEPTH },
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{ "match" , 0, CMD_MATCH },
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{ "geometry", 5, CMD_GEOMETRY },
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{ "pixclock", 1, CMD_PIXCLOCK },
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{ "left" , 1, CMD_LEFT },
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{ "right" , 1, CMD_RIGHT },
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{ "upper" , 1, CMD_UPPER },
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{ "lower" , 1, CMD_LOWER },
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{ "hslen" , 1, CMD_HSLEN },
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{ "vslen" , 1, CMD_VSLEN },
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{ "timings" , 7, CMD_TIMING },
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{ "csync" , 1, CMD_CSYNC },
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{ "gsync" , 1, CMD_GSYNC },
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{ "extsync" , 1, CMD_EXTSYNC },
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{ "bcast" , 1, CMD_BCAST },
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{ "rgba" , 1, CMD_RGBA },
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{ "step" , 1, CMD_STEP },
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{ "move" , 1, CMD_MOVE },
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#endif
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};
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/* taken from linux/fb.h */
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enum {
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FB_SYNC_HOR_HIGH_ACT = 1, /* horizontal sync high active */
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FB_SYNC_VERT_HIGH_ACT = 2, /* vertical sync high active */
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#if ENABLE_FEATURE_FBSET_READMODE
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FB_VMODE_INTERLACED = 1, /* interlaced */
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FB_VMODE_DOUBLE = 2, /* double scan */
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FB_SYNC_EXT = 4, /* external sync */
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FB_SYNC_COMP_HIGH_ACT = 8, /* composite sync high active */
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#endif
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};
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#if ENABLE_FEATURE_FBSET_READMODE
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static void ss(uint32_t *x, uint32_t flag, char *buf, const char *what)
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{
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if (strcmp(buf, what) == 0)
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*x &= ~flag;
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else
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*x |= flag;
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}
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/* Mode db file contains mode definitions like this:
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* mode "800x600-48-lace"
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* # D: 36.00 MHz, H: 33.835 kHz, V: 96.39 Hz
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* geometry 800 600 800 600 8
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* timings 27778 56 80 79 11 128 12
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* laced true
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* hsync high
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* vsync high
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* endmode
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*/
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static int read_mode_db(struct fb_var_screeninfo *base, const char *fn,
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const char *mode)
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{
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char *token[2], *p, *s;
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parser_t *parser = config_open(fn);
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while (config_read(parser, token, 2, 1, "# \t\r", PARSE_NORMAL)) {
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if (strcmp(token[0], "mode") != 0 || !token[1])
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continue;
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p = strstr(token[1], mode);
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if (!p)
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continue;
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s = p + strlen(mode);
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//bb_info_msg("CHECK[%s][%s][%d]", mode, p-1, *s);
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/* exact match? */
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if (((!*s || isspace(*s)) && '"' != s[-1]) /* end-of-token */
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|| ('"' == *s && '"' == p[-1]) /* ends with " but starts with " too! */
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) {
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//bb_info_msg("FOUND[%s][%s][%s][%d]", token[1], p, mode, isspace(*s));
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break;
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}
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}
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if (!token[0])
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return 0;
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while (config_read(parser, token, 2, 1, "# \t", PARSE_NORMAL)) {
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int i;
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//bb_info_msg("???[%s][%s]", token[0], token[1]);
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if (strcmp(token[0], "endmode") == 0) {
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//bb_info_msg("OK[%s]", mode);
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return 1;
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}
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p = token[1];
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i = index_in_strings(
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"geometry\0timings\0interlaced\0double\0vsync\0hsync\0csync\0extsync\0",
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token[0]);
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switch (i) {
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case 0:
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if (sizeof(int) == sizeof(base->xres)) {
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sscanf(p, "%d %d %d %d %d",
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&base->xres, &base->yres,
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&base->xres_virtual, &base->yres_virtual,
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&base->bits_per_pixel);
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} else {
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int base_xres, base_yres;
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int base_xres_virtual, base_yres_virtual;
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int base_bits_per_pixel;
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sscanf(p, "%d %d %d %d %d",
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&base_xres, &base_yres,
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&base_xres_virtual, &base_yres_virtual,
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&base_bits_per_pixel);
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base->xres = base_xres;
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base->yres = base_yres;
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base->xres_virtual = base_xres_virtual;
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base->yres_virtual = base_yres_virtual;
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base->bits_per_pixel = base_bits_per_pixel;
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}
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//bb_info_msg("GEO[%s]", p);
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break;
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case 1:
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if (sizeof(int) == sizeof(base->xres)) {
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sscanf(p, "%d %d %d %d %d %d %d",
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&base->pixclock,
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&base->left_margin, &base->right_margin,
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&base->upper_margin, &base->lower_margin,
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&base->hsync_len, &base->vsync_len);
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} else {
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int base_pixclock;
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int base_left_margin, base_right_margin;
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int base_upper_margin, base_lower_margin;
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int base_hsync_len, base_vsync_len;
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sscanf(p, "%d %d %d %d %d %d %d",
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&base_pixclock,
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&base_left_margin, &base_right_margin,
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&base_upper_margin, &base_lower_margin,
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&base_hsync_len, &base_vsync_len);
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base->pixclock = base_pixclock;
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base->left_margin = base_left_margin;
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base->right_margin = base_right_margin;
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base->upper_margin = base_upper_margin;
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base->lower_margin = base_lower_margin;
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base->hsync_len = base_hsync_len;
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base->vsync_len = base_vsync_len;
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}
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//bb_info_msg("TIM[%s]", p);
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break;
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case 2:
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case 3: {
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static const uint32_t syncs[] = {FB_VMODE_INTERLACED, FB_VMODE_DOUBLE};
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ss(&base->vmode, syncs[i-2], p, "false");
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//bb_info_msg("VMODE[%s]", p);
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break;
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}
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case 4:
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case 5:
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case 6: {
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static const uint32_t syncs[] = {FB_SYNC_VERT_HIGH_ACT, FB_SYNC_HOR_HIGH_ACT, FB_SYNC_COMP_HIGH_ACT};
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ss(&base->sync, syncs[i-4], p, "low");
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//bb_info_msg("SYNC[%s]", p);
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break;
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}
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case 7:
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ss(&base->sync, FB_SYNC_EXT, p, "false");
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//bb_info_msg("EXTSYNC[%s]", p);
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break;
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}
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}
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return 0;
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}
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#endif
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static NOINLINE void showmode(struct fb_var_screeninfo *v)
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{
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double drate = 0, hrate = 0, vrate = 0;
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if (v->pixclock) {
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drate = 1e12 / v->pixclock;
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hrate = drate / (v->left_margin + v->xres + v->right_margin + v->hsync_len);
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vrate = hrate / (v->upper_margin + v->yres + v->lower_margin + v->vsync_len);
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}
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printf("\nmode \"%ux%u-%u\"\n"
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#if ENABLE_FEATURE_FBSET_FANCY
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"\t# D: %.3f MHz, H: %.3f kHz, V: %.3f Hz\n"
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#endif
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"\tgeometry %u %u %u %u %u\n"
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"\ttimings %u %u %u %u %u %u %u\n"
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"\taccel %s\n"
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"\trgba %u/%u,%u/%u,%u/%u,%u/%u\n"
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"endmode\n\n",
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v->xres, v->yres, (int) (vrate + 0.5),
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#if ENABLE_FEATURE_FBSET_FANCY
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drate / 1e6, hrate / 1e3, vrate,
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#endif
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v->xres, v->yres, v->xres_virtual, v->yres_virtual, v->bits_per_pixel,
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v->pixclock, v->left_margin, v->right_margin, v->upper_margin, v->lower_margin,
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v->hsync_len, v->vsync_len,
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(v->accel_flags > 0 ? "true" : "false"),
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v->red.length, v->red.offset, v->green.length, v->green.offset,
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v->blue.length, v->blue.offset, v->transp.length, v->transp.offset);
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}
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int fbset_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int fbset_main(int argc, char **argv)
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{
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enum {
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OPT_CHANGE = (1 << 0),
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OPT_SHOW = (1 << 1),
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OPT_READMODE = (1 << 2),
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OPT_ALL = (1 << 9),
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};
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struct fb_var_screeninfo var_old, var_set;
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int fh, i;
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unsigned options = 0;
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const char *fbdev = DEFAULTFBDEV;
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const char *modefile = DEFAULTFBMODE;
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char *thisarg;
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char *mode = mode; /* for compiler */
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memset(&var_set, 0xff, sizeof(var_set)); /* set all to -1 */
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/* parse cmd args.... why do they have to make things so difficult? */
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argv++;
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argc--;
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for (; argc > 0 && (thisarg = *argv) != NULL; argc--, argv++) {
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if (thisarg[0] == '-') for (i = 0; i < ARRAY_SIZE(g_cmdoptions); i++) {
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if (strcmp(thisarg + 1, g_cmdoptions[i].name) != 0)
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continue;
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if (argc <= g_cmdoptions[i].param_count)
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bb_show_usage();
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switch (g_cmdoptions[i].code) {
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case CMD_FB:
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fbdev = argv[1];
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break;
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case CMD_DB:
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modefile = argv[1];
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break;
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case CMD_ALL:
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options |= OPT_ALL;
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break;
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case CMD_SHOW:
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options |= OPT_SHOW;
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break;
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case CMD_GEOMETRY:
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var_set.xres = xatou32(argv[1]);
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var_set.yres = xatou32(argv[2]);
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var_set.xres_virtual = xatou32(argv[3]);
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var_set.yres_virtual = xatou32(argv[4]);
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var_set.bits_per_pixel = xatou32(argv[5]);
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break;
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case CMD_TIMING:
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var_set.pixclock = xatou32(argv[1]);
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var_set.left_margin = xatou32(argv[2]);
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var_set.right_margin = xatou32(argv[3]);
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var_set.upper_margin = xatou32(argv[4]);
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var_set.lower_margin = xatou32(argv[5]);
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var_set.hsync_len = xatou32(argv[6]);
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var_set.vsync_len = xatou32(argv[7]);
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break;
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case CMD_ACCEL:
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break;
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case CMD_HSYNC:
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var_set.sync |= FB_SYNC_HOR_HIGH_ACT;
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break;
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case CMD_VSYNC:
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var_set.sync |= FB_SYNC_VERT_HIGH_ACT;
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break;
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#if ENABLE_FEATURE_FBSET_FANCY
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case CMD_XRES:
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var_set.xres = xatou32(argv[1]);
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break;
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case CMD_YRES:
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var_set.yres = xatou32(argv[1]);
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break;
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case CMD_DEPTH:
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var_set.bits_per_pixel = xatou32(argv[1]);
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break;
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#endif
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}
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switch (g_cmdoptions[i].code) {
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case CMD_FB:
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case CMD_DB:
|
|
case CMD_ALL:
|
|
case CMD_SHOW:
|
|
break;
|
|
default:
|
|
/* other commands imply changes */
|
|
options |= OPT_CHANGE;
|
|
}
|
|
argc -= g_cmdoptions[i].param_count;
|
|
argv += g_cmdoptions[i].param_count;
|
|
goto contin;
|
|
}
|
|
if (!ENABLE_FEATURE_FBSET_READMODE || argc != 1)
|
|
bb_show_usage();
|
|
mode = *argv;
|
|
options |= OPT_READMODE;
|
|
contin: ;
|
|
}
|
|
|
|
fh = xopen(fbdev, O_RDONLY);
|
|
xioctl(fh, FBIOGET_VSCREENINFO, &var_old);
|
|
|
|
if (options & OPT_READMODE) {
|
|
#if ENABLE_FEATURE_FBSET_READMODE
|
|
if (!read_mode_db(&var_old, modefile, mode)) {
|
|
bb_error_msg_and_die("unknown video mode '%s'", mode);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
if (options & OPT_CHANGE) {
|
|
copy_changed_values(&var_old, &var_set);
|
|
if (options & OPT_ALL)
|
|
var_old.activate = FB_ACTIVATE_ALL;
|
|
xioctl(fh, FBIOPUT_VSCREENINFO, &var_old);
|
|
}
|
|
|
|
if (options == 0 || (options & OPT_SHOW))
|
|
showmode(&var_old);
|
|
|
|
if (ENABLE_FEATURE_CLEAN_UP)
|
|
close(fh);
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|