From 4f5f1a53d449172263e83c5769c92976e0d3332e Mon Sep 17 00:00:00 2001
From: tmk <nobody@nowhere>
Date: Sat, 29 Jan 2011 00:44:05 +0900
Subject: added PS/2 to USB converter use V-USB as protocol stack

---
 ps2_vusb/matrix.c | 492 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 492 insertions(+)
 create mode 100644 ps2_vusb/matrix.c

(limited to 'ps2_vusb/matrix.c')

diff --git a/ps2_vusb/matrix.c b/ps2_vusb/matrix.c
new file mode 100644
index 0000000000..c464733929
--- /dev/null
+++ b/ps2_vusb/matrix.c
@@ -0,0 +1,492 @@
+/*
+ * scan matrix
+ */
+#include <stdint.h>
+#include <stdbool.h>
+#include <avr/io.h>
+#include <util/delay.h>
+#include "print.h"
+#include "util.h"
+#include "debug.h"
+#include "ps2.h"
+#include "usb_keyboard.h"
+#include "matrix_skel.h"
+
+
+#if (MATRIX_COLS > 16)
+#   error "MATRIX_COLS must not exceed 16"
+#endif
+#if (MATRIX_ROWS > 255)
+#   error "MATRIX_ROWS must not exceed 255"
+#endif
+
+
+/*
+ * Matrix usage:
+ * "PS/2 Scan Codes Set 2" is assigned to 256(32x8)cells matrix.
+ * Hmm, It is very sparse and not efficient :(
+ *
+ *      8bit
+ *    ---------
+ *  0|         |
+ *  :|   XX    | 00-7F for normal codes(without E0-prefix)
+ *  f|_________|
+ * 10|         |
+ *  :|  E0 XX  | 80-FF for E0-prefix codes(use (XX|0x80) as code)
+ * 1f|         |
+ *    ---------
+ * exceptions:
+ * 83:    F8[0x83](normal codes but > 0x7F)
+ * FC:    PrintScreen[E0 7C or 84]
+ * FE:    Puause
+ */
+#define F8             (0x83)
+#define PRINT_SCREEN   (0xFC)
+#define PAUSE          (0xFE)
+#define ROW(code)      (code>>3)
+#define COL(code)      (code&0x07)
+
+static bool is_modified = false;
+
+// matrix state buffer(1:on, 0:off)
+#if (MATRIX_COLS <= 8)
+static uint8_t matrix[MATRIX_ROWS];
+#else
+static uint16_t matrix[MATRIX_ROWS];
+#endif
+
+#ifdef MATRIX_HAS_GHOST
+static bool matrix_has_ghost_in_row(uint8_t row);
+#endif
+static void matrix_make(uint8_t code);
+static void matrix_break(uint8_t code);
+static void ps2_reset(void);
+static void ps2_set_leds(uint8_t leds);
+
+
+inline
+uint8_t matrix_rows(void)
+{
+    return MATRIX_ROWS;
+}
+
+inline
+uint8_t matrix_cols(void)
+{
+    return MATRIX_COLS;
+}
+
+void matrix_init(void)
+{
+    ps2_host_init();
+    _delay_ms(1000);
+
+    // flush LEDs
+/*
+    ps2_set_leds(1<<PS2_LED_NUM_LOCK);
+    _delay_ms(100);
+    ps2_set_leds(1<<PS2_LED_NUM_LOCK|1<<PS2_LED_CAPS_LOCK);
+    _delay_ms(100);
+    ps2_set_leds(1<<PS2_LED_NUM_LOCK|1<<PS2_LED_CAPS_LOCK|1<<PS2_LED_SCROLL_LOCK);
+    _delay_ms(300);
+    ps2_set_leds(0x00);
+*/
+    
+    // initialize matrix state: all keys off
+    for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
+
+    return;
+}
+
+/*
+ * PS/2 Scan Code Set 2: Exceptional Handling
+ *
+ * There are several keys to be handled exceptionally.
+ * The scan code for these keys are varied or prefix/postfix'd
+ * depending on modifier key state.
+ *
+ * References:
+ *     http://www.microsoft.com/whdc/archive/scancode.mspx
+ *     http://download.microsoft.com/download/1/6/1/161ba512-40e2-4cc9-843a-923143f3456c/scancode.doc
+ *
+ *
+ * Insert, Delete, Home, End, PageUp, PageDown, Up, Down, Right, Left:
+ *     Num Lock: off
+ *     modifiers | make                      | break
+ *     ----------+---------------------------+----------------------
+ *     Ohter     |                    <make> | <break>
+ *     LShift    | E0 F0 12           <make> | <break>  E0 12
+ *     RShift    | E0 F0 59           <make> | <break>  E0 59
+ *     L+RShift  | E0 F0 12  E0 F0 59 <make> | <break>  E0 59 E0 12
+ *
+ *     Num Lock: on
+ *     modifiers | make                      | break
+ *     ----------+---------------------------+----------------------
+ *     Other     | E0 12              <make> | <break>  E0 F0 12
+ *     Shift'd   |                    <make> | <break>
+ *
+ *     Handling: ignore these prefix/postfix codes
+ *
+ *
+ * Keypad-/:
+ *     modifiers | make                      | break
+ *     ----------+---------------------------+----------------------
+ *     Ohter     |                    <make> | <break>
+ *     LShift    | E0 F0 12           <make> | <break>  E0 12
+ *     RShift    | E0 F0 59           <make> | <break>  E0 59
+ *     L+RShift  | E0 F0 12  E0 F0 59 <make> | <break>  E0 59 E0 12
+ *
+ *     Handling: ignore these prefix/postfix codes
+ *
+ *
+ * PrintScreen:
+ *     With hoding down modifiers, the scan code is sent as following:
+ *
+ *     modifiers | make         | break
+ *     ----------+--------------+-----------------------------------
+ *     Other     | E0 12  E0 7C | E0 F0 7C  E0 F0 12
+ *     Shift'd   |        E0 7C | E0 F0 7C
+ *     Control'd |        E0 7C | E0 F0 7C
+ *     Alt'd     |           84 | F0 84
+ *
+ *     Handling: ignore prefix/postfix codes and treat both scan code
+ *               E0 7C and 84 as PrintScreen.
+ *
+ * Pause:
+ *     With hoding down modifiers, the scan code is sent as following:
+ *
+ *     modifiers | make(no break code)
+ *     ----------+--------------------------------------------------
+ *     no mods   | E1 14 77 E1 F0 14 F0 77
+ *     Control'd | E0 7E E0 F0 7E
+ *
+ *     Handling: treat these two code sequence as Pause
+ *
+ */
+uint8_t matrix_scan(void)
+{
+
+    static enum {
+        INIT,
+        F0,
+        E0,
+        E0_F0,
+        // states for Pause/Break
+        E1,
+        E1_14,
+        E1_14_77,
+        E1_14_77_E1,
+        E1_14_77_E1_F0,
+        E1_14_77_E1_F0_14,
+        E1_14_77_E1_F0_14_F0,
+    } state = INIT;
+
+
+    is_modified = false;
+
+    // Pause/Break off(PS/2 has no break for this key)
+    if (matrix_is_on(ROW(PAUSE), COL(PAUSE))) {
+        matrix_break(PAUSE);
+    }
+
+    uint8_t code;
+    while ((code = ps2_host_recv())) {
+//debug_hex(code); debug(" ");
+        switch (state) {
+            case INIT:
+                switch (code) {
+                    case 0xE0:  // 2byte make
+                        state = E0;
+                        break;
+                    case 0xF0:  // break code
+                        state = F0;
+                        break;
+                    case 0xE1:  // Pause/Break
+                        state = E1;
+                        break;
+                    case 0x83:  // F8
+                        matrix_make(F8);
+                        state = INIT;
+                        break;
+                    case 0x84:  // PrintScreen
+                        matrix_make(PRINT_SCREEN);
+                        state = INIT;
+                        break;
+                    default:    // normal key make
+                        if (code < 0x80) {
+                            matrix_make(code);
+                        } else {
+                            debug("unexpected scan code at INIT: "); debug_hex(code); debug("\n");
+                        }
+                        state = INIT;
+                }
+                break;
+            case E0:
+                switch (code) {
+                    case 0x12:  // postfix/postfix code for exceptional keys
+                    case 0x59:  // postfix/postfix code for exceptional keys
+                        // ignore
+                        state = INIT;
+                        break;
+                    case 0x7E:  // former part of Control-Pause[E0 7E  E0 F0 7E]
+                        matrix_make(PAUSE);
+                        state = INIT;
+                        break;
+                    case 0xF0:  // E0 break
+                        state = E0_F0;
+                        break;
+                    default:    // E0 make
+                        if (code < 0x80) {
+                            matrix_make(code|0x80);
+                        } else {
+                            debug("unexpected scan code at E0: "); debug_hex(code); debug("\n");
+                        }
+                        state = INIT;
+                }
+                break;
+            case F0:
+                switch (code) {
+                    case 0x83:
+                        matrix_break(F8);
+                        state = INIT;
+                        break;
+                    case 0x84:
+                        matrix_break(PRINT_SCREEN);
+                        state = INIT;
+                        break;
+                    default:
+                    if (code < 0x80) {
+                        matrix_break(code);
+                    } else {
+                        debug("unexpected scan code at F0: "); debug_hex(code); debug("\n");
+                    }
+                    state = INIT;
+                }
+                break;
+            case E0_F0: // E0 break
+                switch (code) {
+                    case 0x12:  // postfix/postfix code for exceptional keys
+                    case 0x59:  // postfix/postfix code for exceptional keys
+                    case 0x7E:  // latter part of Control-Pause[E0 7E  E0 F0 7E]
+                        // ignore
+                        state = INIT;
+                        break;
+                    default:
+                        if (code < 0x80) {
+                            matrix_break(code|0x80);
+                        } else {
+                            debug("unexpected scan code at E0_F0: "); debug_hex(code); debug("\n");
+                        }
+                        state = INIT;
+                }
+                break;
+            /* Pause */
+            case E1:
+                switch (code) {
+                    case 0x14:
+                        state = E1_14;
+                        break;
+                    default:
+                        state = INIT;
+                }
+                break;
+            case E1_14:
+                switch (code) {
+                    case 0x77:
+                        state = E1_14_77;
+                        break;
+                    default:
+                        state = INIT;
+                }
+                break;
+            case E1_14_77:
+                switch (code) {
+                    case 0xE1:
+                        state = E1_14_77_E1;
+                        break;
+                    default:
+                        state = INIT;
+                }
+                break;
+            case E1_14_77_E1:
+                switch (code) {
+                    case 0xF0:
+                        state = E1_14_77_E1_F0;
+                        break;
+                    default:
+                        state = INIT;
+                }
+                break;
+            case E1_14_77_E1_F0:
+                switch (code) {
+                    case 0x14:
+                        state = E1_14_77_E1_F0_14;
+                        break;
+                    default:
+                        state = INIT;
+                }
+                break;
+            case E1_14_77_E1_F0_14:
+                switch (code) {
+                    case 0xF0:
+                        state = E1_14_77_E1_F0_14_F0;
+                        break;
+                    default:
+                        state = INIT;
+                }
+                break;
+            case E1_14_77_E1_F0_14_F0:
+                switch (code) {
+                    case 0x77:
+                        matrix_make(PAUSE);
+                        state = INIT;
+                        break;
+                    default:
+                        state = INIT;
+                }
+                break;
+            default:
+                state = INIT;
+        }
+    }
+
+    // handle LED indicators
+/*
+    static uint8_t prev_leds = 0;
+    if (prev_leds != usb_keyboard_leds) {
+        uint8_t leds = 0;
+        if (usb_keyboard_leds&(1<<USB_LED_SCROLL_LOCK))
+            leds |= (1<<PS2_LED_SCROLL_LOCK);
+        if (usb_keyboard_leds&(1<<USB_LED_NUM_LOCK))
+            leds |= (1<<PS2_LED_NUM_LOCK);
+        if (usb_keyboard_leds&(1<<USB_LED_CAPS_LOCK))
+            leds |= (1<<PS2_LED_CAPS_LOCK);
+
+        ps2_set_leds(leds);
+        prev_leds = usb_keyboard_leds;
+    }
+*/
+
+    return 1;
+}
+
+bool matrix_is_modified(void)
+{
+    return is_modified;
+}
+
+inline
+bool matrix_has_ghost(void)
+{
+#ifdef MATRIX_HAS_GHOST
+    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+        if (matrix_has_ghost_in_row(i))
+            return true;
+    }
+#endif
+    return false;
+}
+
+inline
+bool matrix_is_on(uint8_t row, uint8_t col)
+{
+    return (matrix[row] & (1<<col));
+}
+
+inline
+#if (MATRIX_COLS <= 8)
+uint8_t matrix_get_row(uint8_t row)
+#else
+uint16_t matrix_get_row(uint8_t row)
+#endif
+{
+    return matrix[row];
+}
+
+void matrix_print(void)
+{
+#if (MATRIX_COLS <= 8)
+    print("\nr/c 01234567\n");
+#else
+    print("\nr/c 0123456789ABCDEF\n");
+#endif
+    for (uint8_t row = 0; row < matrix_rows(); row++) {
+        phex(row); print(": ");
+#if (MATRIX_COLS <= 8)
+        pbin_reverse(matrix_get_row(row));
+#else
+        pbin_reverse16(matrix_get_row(row));
+#endif
+#ifdef MATRIX_HAS_GHOST
+        if (matrix_has_ghost_in_row(row)) {
+            print(" <ghost");
+        }
+#endif
+        print("\n");
+    }
+}
+
+uint8_t matrix_key_count(void)
+{
+    uint8_t count = 0;
+    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+#if (MATRIX_COLS <= 8)
+        count += bitpop(matrix[i]);
+#else
+        count += bitpop16(matrix[i]);
+#endif
+    }
+    return count;
+}
+
+#ifdef MATRIX_HAS_GHOST
+inline
+static bool matrix_has_ghost_in_row(uint8_t row)
+{
+    // no ghost exists in case less than 2 keys on
+    if (((matrix[row] - 1) & matrix[row]) == 0)
+        return false;
+
+    // ghost exists in case same state as other row
+    for (uint8_t i=0; i < MATRIX_ROWS; i++) {
+        if (i != row && (matrix[i] & matrix[row]) == matrix[row])
+            return true;
+    }
+    return false;
+}
+#endif
+
+
+inline
+static void matrix_make(uint8_t code)
+{
+    if (!matrix_is_on(ROW(code), COL(code))) {
+        matrix[ROW(code)] |= 1<<COL(code);
+        is_modified = true;
+    }
+}
+
+inline
+static void matrix_break(uint8_t code)
+{
+    if (matrix_is_on(ROW(code), COL(code))) {
+        matrix[ROW(code)] &= ~(1<<COL(code));
+        is_modified = true;
+    }
+}
+
+static void ps2_reset(void)
+{
+    ps2_host_send(0xFF);
+    if (ps2_host_recv() != 0xFA) return;
+    _delay_ms(1000);
+    if (ps2_host_recv() != 0xAA) return;
+}
+
+static void ps2_set_leds(uint8_t leds)
+{
+        ps2_host_send(0xED);
+        if (ps2_host_recv() != 0xFA) return;        // 0xFA
+        ps2_host_send(leds);
+        if (ps2_host_recv() != 0xFA) return;        // 0xFA
+}
-- 
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