1 files changed, 139 insertions, 0 deletions

diff --git a/drivers/ps2/ps2.h b/drivers/ps2/ps2.h
new file mode 100644
index 000000000..f12319285
--- /dev/null
+++ b/drivers/ps2/ps2.h
@@ -0,0 +1,139 @@
+/*
+Copyright 2010,2011,2012,2013 Jun WAKO <wakojun@gmail.com>
+
+This software is licensed with a Modified BSD License.
+All of this is supposed to be Free Software, Open Source, DFSG-free,
+GPL-compatible, and OK to use in both free and proprietary applications.
+Additions and corrections to this file are welcome.
+
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright
+  notice, this list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright
+  notice, this list of conditions and the following disclaimer in
+  the documentation and/or other materials provided with the
+  distribution.
+
+* Neither the name of the copyright holders nor the names of
+  contributors may be used to endorse or promote products derived
+  from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#pragma once
+
+#include <stdbool.h>
+#include "wait.h"
+#include "ps2_io.h"
+#include "print.h"
+
+/*
+ * Primitive PS/2 Library for AVR
+ *
+ * PS/2 Resources
+ * --------------
+ * [1] The PS/2 Mouse/Keyboard Protocol
+ * http://www.computer-engineering.org/ps2protocol/
+ * Concise and thorough primer of PS/2 protocol.
+ *
+ * [2] Keyboard and Auxiliary Device Controller
+ * http://www.mcamafia.de/pdf/ibm_hitrc07.pdf
+ * Signal Timing and Format
+ *
+ * [3] Keyboards(101- and 102-key)
+ * http://www.mcamafia.de/pdf/ibm_hitrc11.pdf
+ * Keyboard Layout, Scan Code Set, POR, and Commands.
+ *
+ * [4] PS/2 Reference Manuals
+ * http://www.mcamafia.de/pdf/ibm_hitrc07.pdf
+ * Collection of IBM Personal System/2 documents.
+ *
+ * [5] TrackPoint Engineering Specifications for version 3E
+ * https://web.archive.org/web/20100526161812/http://wwwcssrv.almaden.ibm.com/trackpoint/download.html
+ */
+#define PS2_ACK 0xFA
+#define PS2_RESEND 0xFE
+#define PS2_SET_LED 0xED
+
+// TODO: error numbers
+#define PS2_ERR_NONE 0
+#define PS2_ERR_STARTBIT1 1
+#define PS2_ERR_STARTBIT2 2
+#define PS2_ERR_STARTBIT3 3
+#define PS2_ERR_PARITY 0x10
+#define PS2_ERR_NODATA 0x20
+
+#define PS2_LED_SCROLL_LOCK 0
+#define PS2_LED_NUM_LOCK 1
+#define PS2_LED_CAPS_LOCK 2
+
+extern uint8_t ps2_error;
+
+void    ps2_host_init(void);
+uint8_t ps2_host_send(uint8_t data);
+uint8_t ps2_host_recv_response(void);
+uint8_t ps2_host_recv(void);
+void    ps2_host_set_led(uint8_t usb_led);
+
+/*--------------------------------------------------------------------
+ * static functions
+ *------------------------------------------------------------------*/
+static inline uint16_t wait_clock_lo(uint16_t us) {
+    while (clock_in() && us) {
+        asm("");
+        wait_us(1);
+        us--;
+    }
+    return us;
+}
+static inline uint16_t wait_clock_hi(uint16_t us) {
+    while (!clock_in() && us) {
+        asm("");
+        wait_us(1);
+        us--;
+    }
+    return us;
+}
+static inline uint16_t wait_data_lo(uint16_t us) {
+    while (data_in() && us) {
+        asm("");
+        wait_us(1);
+        us--;
+    }
+    return us;
+}
+static inline uint16_t wait_data_hi(uint16_t us) {
+    while (!data_in() && us) {
+        asm("");
+        wait_us(1);
+        us--;
+    }
+    return us;
+}
+
+/* idle state that device can send */
+static inline void idle(void) {
+    clock_hi();
+    data_hi();
+}
+
+/* inhibit device to send */
+static inline void inhibit(void) {
+    clock_lo();
+    data_hi();
+}