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annotate packages/services/gfx/mw/current/src/drivers/vtswitch.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
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1 #include <unistd.h>
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2 #include <fcntl.h>
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3 #include <signal.h>
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4 #include <sys/ioctl.h>
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5 #include <sys/time.h>
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6 #include <linux/vt.h>
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7 #include "device.h"
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8 #include "fb.h"
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9 /*
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10 * VT switch handling code for Linux
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11 */
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12
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13 /* signal to use when VT swithing*/
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14 #ifndef SIGUNUSED
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15 #define SIGUNUSED SIGUSR1 /* some systems lack SIGUNUSED*/
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16 #endif
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17
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18 #define SIGVTSWITCH SIGUNUSED /* SIGUSR2 is used by pthreads...*/
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19
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20 int mwvterm; /* the VT we were started on */
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21 volatile int mwdrawing; /* nonzero when drawing is happening*/
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22 static int mwcvt, mwocvt;
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23 static int ttyfd = -1; /* /dev/tty0*/
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24 static int visible = 1; /* VT visible flag*/
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25 static struct vt_mode mode; /* terminal mode*/
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26 static SUBDRIVER save; /* saved subdriver when VT switched*/
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27
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28 extern SCREENDEVICE scrdev; /* FIXME */
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29
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30 /* entry points*/
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31 int MwInitVt(void);
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32 int MwCurrentVt(void);
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33 int MwCheckVtChange(void);
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34 void MwRedrawVt(int t);
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35
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36 /* local routines*/
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37 static void draw_enable(void);
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38 static void draw_disable(void);
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39 static void vt_switch(int sig);
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40
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41 /* null subdriver for drawing when switched out*/
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42 static void null_drawpixel(PSD psd,MWCOORD x, MWCOORD y, MWPIXELVAL c) {}
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43 static MWPIXELVAL null_readpixel(PSD psd,MWCOORD x, MWCOORD y) { return 0;}
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44 static void null_drawhorzline(PSD psd,MWCOORD x1,MWCOORD x2,MWCOORD y,
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45 MWPIXELVAL c) {}
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46 static void null_drawvertline(PSD psd,MWCOORD x,MWCOORD y1,MWCOORD y2,
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47 MWPIXELVAL c) {}
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48 static void null_fillrect(PSD psd,MWCOORD x1,MWCOORD y1,MWCOORD x2,
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49 MWCOORD y2,MWPIXELVAL c) {}
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50 static void null_blit(PSD dstpsd,MWCOORD destx,MWCOORD desty,MWCOORD w,
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51 MWCOORD h,PSD srcpsd,MWCOORD srcx,MWCOORD srcy,
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52 long op) {}
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53 static void null_drawarea(PSD psd, driver_gc_t *gc, int op) {}
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54 static SUBDRIVER nulldriver = {
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55 NULL,
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56 null_drawpixel,
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57 null_readpixel,
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58 null_drawhorzline,
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59 null_drawvertline,
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60 null_fillrect,
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61 null_blit,
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62 null_drawarea
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63 };
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64
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65 static void
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66 draw_enable(void)
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67 {
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68 if(visible)
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69 return;
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70 visible = 1;
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71
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72 /* restore screen drawing functions*/
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73 set_subdriver(&scrdev, &save, FALSE);
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74 }
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75
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76 static void
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77 draw_disable(void)
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78 {
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79 if(!visible)
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80 return;
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81 visible = 0;
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82
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83 /* save screen drawing functions and reroute drawing*/
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84 get_subdriver(&scrdev, &save);
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85
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86 /* set null driver*/
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87 set_subdriver(&scrdev, &nulldriver, FALSE);
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88 }
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89
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90 /* Timer handler used to do the VT switch at a time when not drawing */
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91 static void
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92 vt_do_switch(void *arg)
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93 {
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94 static unsigned short r[16], g[16], b[16];
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95
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96 /*
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97 * If a drawing function is in progress then we cannot mode
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98 * switch right now because the drawing function would continue to
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99 * scribble on the screen after the switch. So disable further
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100 * drawing and schedule an alarm to try again in .1 second.
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101 */
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102 if(mwdrawing) {
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103 draw_disable ();
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104 GdAddTimer(100, vt_do_switch, NULL);
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105 return;
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106 }
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107
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108 if(visible) {
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109 draw_disable ();
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110 ioctl_getpalette(0, 16, r, g, b);
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111
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112 if(ioctl (ttyfd, VT_RELDISP, 1) == -1)
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113 EPRINTF("Error can't switch away from VT: %m\n");
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114 } else {
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115 ioctl_setpalette(0, 16, r, g, b);
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116 draw_enable ();
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117
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118 if(ioctl (ttyfd, VT_RELDISP, VT_ACKACQ) == -1)
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119 EPRINTF("Error can't acknowledge VT switch: %m\n");
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120 }
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121 }
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122
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123 /* Signal handler called when kernel switches to or from our tty*/
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124 static void
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125 vt_switch(int sig)
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126 {
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127 signal(SIGVTSWITCH, vt_switch);
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128 vt_do_switch(NULL);
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129 }
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130
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131 /*
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132 * Init VT switch catching code
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133 * return 0 on success, -1 on error
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134 */
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135 int
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136 MwInitVt(void)
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137 {
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138 ttyfd = open("/dev/tty0", O_RDONLY);
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139 if(ttyfd == -1)
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140 return EPRINTF("Error can't open tty0: %m\n");
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141
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142 /* setup new tty mode*/
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143 if(ioctl (ttyfd, VT_GETMODE, &mode) == -1)
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144 return EPRINTF("Error can't get VT mode: %m\n");
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145
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146 mode.mode = VT_PROCESS;
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147 mode.relsig = SIGVTSWITCH;
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148 mode.acqsig = SIGVTSWITCH;
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149 signal (SIGVTSWITCH, vt_switch);
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150 if(ioctl (ttyfd, VT_SETMODE, &mode) == -1)
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151 return EPRINTF("Error can't set VT mode: %m\n");
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152
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153 mwcvt = mwocvt = mwvterm = MwCurrentVt();
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154 /*
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155 * Note: this hack is required to get Linux
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156 * to orient virtual 0,0 with physical 0,0
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157 * I have no idea why this kluge is required...
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158 */
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159 MwRedrawVt(mwvterm);
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160
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161 return 0;
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162 }
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163
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164 /*
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165 * This function is used to find out what the current active VT is.
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166 */
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167 int
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168 MwCurrentVt(void)
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169 {
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170 struct vt_stat stat;
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171
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172 ioctl(ttyfd, VT_GETSTATE, &stat);
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173 return stat.v_active;
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174 }
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175
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176 /*
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177 * Check if our VT has changed. Return 1 if so.
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178 */
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179 int
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180 MwCheckVtChange(void)
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181 {
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182 mwcvt = MwCurrentVt();
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183 if(mwcvt != mwocvt && mwcvt == mwvterm) {
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184 mwocvt = mwcvt;
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185 return 1;
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186 }
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187 mwocvt = mwcvt;
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188 return 0;
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189 }
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190
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191 /*
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192 * This function is used to cause a redraw of the text console.
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193 * FIXME: Switching to another console and
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194 * back works, but that's a really dirty hack
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195 */
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196 void
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197 MwRedrawVt(int t)
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198 {
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199 if(MwCurrentVt() == mwvterm) {
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200 ioctl(ttyfd, VT_ACTIVATE, t == 1 ? 2 : 1); /* Awful hack!!*/
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201 ioctl(ttyfd, VT_ACTIVATE, t);
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202 }
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203 }
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204
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205 void
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206 MwExitVt(void)
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207 {
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208 signal(SIGVTSWITCH, SIG_DFL);
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209 mode.mode = VT_AUTO;
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210 mode.relsig = 0;
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211 mode.acqsig = 0;
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212 ioctl(ttyfd, VT_SETMODE, &mode);
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213
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214 if(ttyfd != -1)
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215 close(ttyfd);
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216 }