Taos: cleanup GPIO pins.

Author: maximumspatium

devices/video/taos.cpp

@@ -91,7 +91,8 @@ uint32_t TaosVideo::read(uint32_t rgn_start, uint32_t offset, int size) {
     case CRT_CTRL:
         return this->crt_ctrl;
     case GPIO_IN:
-        return ((this->mon_id << 29) | (vsync_active << 25)) & ~this->gpio_cfg;
+        return ((this->mon_id << GPIO_MONID) | (1 << GPIO_CDTRAY) |
+                (vsync_active << GPIO_VSYNC)) & ~this->gpio_cfg;
     case INT_ENABLES:
         return this->int_enables;
     case TAOS_VERSION:

devices/video/taos.h

@@ -111,6 +111,13 @@ enum {
     MON_ID_VGA  = 6  // GPIO_0 = "1", GPIO_1 = "1", GPIO_2 = "0"
 };
 
+/** Definitions for the GPIO pins. */
+enum {
+    GPIO_MONID      = 29, // GPIO 0..2 are monitor identification pins
+    GPIO_CDTRAY     = 27, // GPIO 4: "1" - CD-ROM tray is closed
+    GPIO_VSYNC      = 25, // GPIO 6: vertical synch input (active low)
+};
+
 /** Broktree Bt856 digital video encoder. */
 class Bt856 : public I2CDevice, public HWComponent {
 public: