Translate fx-9860G Slim keyboard scancodes to standard scancodes

The Slim has two keys that the standard 9860G doesn't: HELP and LIGHT.
Those are mapped to virtual scancodes, resulting in virtual keycodes.

include/gint/drivers/keydev.h

@@ -135,9 +135,9 @@ typedef struct {
    is useful for demo/replays that input events without the physical keyboard,
    and a couple of corner uses like control over USB.
 
-   The keyboard device has built-in event transformations, which modifty the
+   The keyboard device has built-in event transformations, which modify the
    stream of events by adding information, combining modifiers, and removing
-   undesired events. Because the event transformation reky on the current state
+   undesired events. Because the event transformation rely on the current state
    of the keyboard, they must be run by the driver whenever events are read, so
    they are tied to the device.
 
@@ -173,7 +173,7 @@ typedef struct {
 
 	/* Candidate key for repeats (or 0 if no key is candidate yet) */
 	int rep_key;
-	/* Number of repeats alreay sent */
+	/* Number of repeats already sent */
 	int rep_count;
 	/* Time since key was first pressed (us) */
 	int rep_time;
@@ -181,7 +181,7 @@ typedef struct {
 	int rep_delay;
 
 	/* Latest state of keys we are aware of. At every processing step, the
-	   different between this and the fresh information is queued and this
+	   difference between this and the fresh information is queued and this
 	   is updated. state_now is identical to the real state obtained from
 	   the device unless earlier events failed to be queued, in which case
 	   a difference is maintained so they will be reconsidered later. */

include/gint/keyboard.h

@@ -207,7 +207,7 @@ enum {
 	/* Enable modifiers keys */
 	GETKEY_MOD_SHIFT   = 0x01,
 	GETKEY_MOD_ALPHA   = 0x02,
-	/* SHIFT + OPTN toggles backlight (requires GETKEY_MOD_SHIFT) */
+	/* SHIFT + OPTN (requires GETKEY_MOD_SHIFT) or LIGHT toggles backlight */
 	GETKEY_BACKLIGHT   = 0x04,
 	/* MENU triggers a task switch and displays the main menu */
 	GETKEY_MENU        = 0x08,

include/gint/keycodes.h

@@ -75,6 +75,10 @@ enum {
 	   of the matrix one could use a ghosting effect to boot the calc. */
 	KEY_ACON	= 0x07,
 
+	/* Virtual key codes */
+	KEY_HELP	= 0x20, /* fx-9860G Slim: 0x75 */
+	KEY_LIGHT	= 0x10, /* fx-9860G Slim: 0x76 */
+
 	/* Key aliases (handle with care =D) */
 	KEY_X2		= KEY_SQUARE,
 	KEY_CARET	= KEY_POWER,

src/keysc/getkey.c

@@ -51,7 +51,8 @@ key_event_t getkey_opt(int opt, volatile int *timeout)
 		#ifdef FX9860G
 		/* Backlight toggle */
 		if((opt & GETKEY_BACKLIGHT) && e.type == KEYEV_DOWN &&
-			e.key == KEY_OPTN && e.shift && !e.alpha)
+			((e.key == KEY_LIGHT) ||
+				(e.key == KEY_OPTN && e.shift && !e.alpha)))
 		{
 			t6k11_backlight(-1);
 			continue;

src/keysc/iokbd.c

@@ -4,6 +4,7 @@
 
 #include <gint/defs/types.h>
 #include <gint/mpu/pfc.h>
+#include <gint/hardware.h>
 
 /* This file is SH7705-only. */
 #ifdef FX9860G
@@ -111,12 +112,57 @@ uint8_t iokbd_row(int row)
 	return input;
 }
 
+static const uint16_t SLIM_SC[] = {
+	0x0940, 0x0920, 0x0910, 0x0908, 0x0904, 0x0902,
+	0x0840, 0x0820, 0x0810, 0x0808,
+	0x0740, 0x0720, 0x0710, 0x0708, 0x0704, 0x0702,
+	0x0640, 0x0620, 0x0610, 0x0608, 0x0604, 0x0602,
+	0x0540, 0x0520, 0x0510, 0x0508, 0x0504, 0x0502,
+	0x0440, 0x0420, 0x0410, 0x0408, 0x0404, 0x0402,
+	0x0340, 0x0320, 0x0310, 0x0308, 0x0304, 0x0302,
+	0x0240, 0x0220, 0x0210, 0x0208, 0x0204, 0x0202,
+	                                                0x0101,
+	        0x0020, 0x0010, 0x0008, 0x0004, 0x0002
+};
+
+#define SCANCODE_COUNT (sizeof(SLIM_SC) / sizeof(uint16_t))
+
+static const uint16_t SLIM_TR[] = {
+	0x0940, 0x0620, 0x0720, 0x0710, 0x0804, 0x0802,
+	0x0808, 0x0640, 0x0840, 0x0740,
+	0x0910, 0x0608, 0x0502, 0x0810, 0x0280, 0x0180,
+	0x0920, 0x0610, 0x0504, 0x0820, 0x0704, 0x0702,
+	0x0904, 0x0602, 0x0420, 0x0320, 0x0220, 0x0120,
+	0x0908, 0x0604, 0x0440, 0x0340, 0x0240, 0x0140,
+	0x0708, 0x0520, 0x0408, 0x0308, 0x0208, 0x0108,
+	0x0902, 0x0540, 0x0410, 0x0310, 0x0210, 0x0110,
+	                                                0x0001,
+	        0x0510, 0x0508, 0x0304, 0x0104, 0x0204
+};
+
 /* iokbd_scan() - scan ports A/B/M to generate 12 rows of key data */
 void iokbd_scan(uint8_t *scan)
 {
-	/* Scan each row independently; the gain from scanning them altogether
+	/* Scan each row independently; the gain from scanning them all together
 	   is probably not worth it */
 	for(int i = 0; i < 12; i++) scan[i] = iokbd_row(i);
+
+	/* Translate fx-9860G Slim scancodes to standard scancodes */
+	if (gint[HWCALC] == HWCALC_FX9860G_SLIM)
+	{
+		uint8_t slim_scan[12];
+		for (uint i = 0; i < 10; i++)
+		{
+			slim_scan[i] = scan[i];
+			scan[i] = 0x00;
+		}
+
+		for (uint i = 0; i < SCANCODE_COUNT; ++i)
+		{
+			if (slim_scan[SLIM_SC[i] >> 8] & (SLIM_SC[i] & 0xFF))
+				scan[SLIM_TR[i] >> 8] |= (SLIM_TR[i] & 0xFF);
+		}
+	}
 }
 
 #endif /* FX9860G */