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tmk_keyboard_custom/ps2_mouse.c

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2011-07-20 15:32:52 +00:00
/*
Copyright 2011 Jun Wako <wakojun@gmail.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdbool.h>
#include<avr/io.h>
#include<util/delay.h>
#include "ps2.h"
#include "ps2_mouse.h"
#include "usb_mouse.h"
#define PS2_MOUSE_DEBUG
#ifdef PS2_MOUSE_DEBUG
# include "print.h"
# include "debug.h"
#else
# define print(s)
# define phex(h)
# define phex16(h)
#endif
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// disable when errors occur 255 times.
#define ERROR_RETURN() do { \
if (ps2_error) { \
if (ps2_mouse_error_count < 255) { \
ps2_mouse_error_count++; \
} else { \
ps2_mouse_error_count = 0; \
ps2_mouse_enable = false; \
} \
return ps2_error; \
} \
} while (0)
/*
TODO
----
- Stream mode
- Tracpoint command support: needed
- Middle button + move = Wheel traslation
*/
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bool ps2_mouse_enable = true;
uint8_t ps2_mouse_x = 0;
uint8_t ps2_mouse_y = 0;
uint8_t ps2_mouse_btn = 0;
uint8_t ps2_mouse_error_count = 0;
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static uint8_t ps2_mouse_btn_prev = 0;
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uint8_t ps2_mouse_init(void) {
uint8_t rcv;
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if (!ps2_mouse_enable) return 1;
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ps2_host_init();
// Reset
rcv = ps2_host_send(0xFF);
print("ps2_mouse_init: send 0xFF: ");
phex(ps2_error); print("\n");
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ERROR_RETURN();
// ACK
rcv = ps2_host_recv();
print("ps2_mouse_init: read ACK: ");
phex(rcv); phex(ps2_error); print("\n");
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ERROR_RETURN();
// BAT takes some time
_delay_ms(100);
rcv = ps2_host_recv();
print("ps2_mouse_init: read BAT: ");
phex(rcv); phex(ps2_error); print("\n");
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ERROR_RETURN();
// Device ID
rcv = ps2_host_recv();
print("ps2_mouse_init: read DevID: ");
phex(rcv); phex(ps2_error); print("\n");
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ERROR_RETURN();
// Enable data reporting
ps2_host_send(0xF4);
print("ps2_mouse_init: send 0xF4: ");
phex(ps2_error); print("\n");
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ERROR_RETURN();
// ACK
rcv = ps2_host_recv();
print("ps2_mouse_init: read ACK: ");
phex(rcv); phex(ps2_error); print("\n");
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ERROR_RETURN();
// Set Remote mode
ps2_host_send(0xF0);
print("ps2_mouse_init: send 0xF0: ");
phex(ps2_error); print("\n");
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ERROR_RETURN();
// ACK
rcv = ps2_host_recv();
print("ps2_mouse_init: read ACK: ");
phex(rcv); phex(ps2_error); print("\n");
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ERROR_RETURN();
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return 0;
}
/*
Data format:
bit: 7 6 5 4 3 2 1 0
-----------------------------------------------------------------------
0 btn: Yovflw Xovflw Ysign Xsign 1 Middle Right Left
1 x: X movement(0-255)
2 y: Y movement(0-255)
*/
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uint8_t ps2_mouse_read(void)
{
uint8_t rcv;
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if (!ps2_mouse_enable) return 1;
ps2_host_send(0xEB);
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ERROR_RETURN();
rcv=ps2_host_recv();
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ERROR_RETURN();
if(rcv==0xFA) {
ps2_mouse_btn = ps2_host_recv();
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ERROR_RETURN();
ps2_mouse_x = ps2_host_recv();
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ERROR_RETURN();
ps2_mouse_y = ps2_host_recv();
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ERROR_RETURN();
}
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return 0;
}
bool ps2_mouse_changed(void)
{
return (ps2_mouse_x || ps2_mouse_y || (ps2_mouse_btn & PS2_MOUSE_BTN_MASK) != ps2_mouse_btn_prev);
}
#define PS2_MOUSE_SCROLL_BUTTON 0x04
void ps2_mouse_usb_send(void)
{
static bool scrolled = false;
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if (!ps2_mouse_enable) return;
if (ps2_mouse_changed()) {
int8_t x, y, v, h;
x = y = v = h = 0;
// convert scale of X, Y: PS/2(-256/255) -> USB(-127/127)
if (ps2_mouse_btn & (1<<PS2_MOUSE_X_SIGN))
x = ps2_mouse_x > 128 ? (int8_t)ps2_mouse_x : -127;
else
x = ps2_mouse_x < 128 ? (int8_t)ps2_mouse_x : 127;
if (ps2_mouse_btn & (1<<PS2_MOUSE_Y_SIGN))
y = ps2_mouse_y > 128 ? (int8_t)ps2_mouse_y : -127;
else
y = ps2_mouse_y < 128 ? (int8_t)ps2_mouse_y : 127;
// Y is needed to reverse
y = -y;
if (ps2_mouse_btn & PS2_MOUSE_SCROLL_BUTTON) {
// scroll
if (x > 0 || x < 0) h = (x > 64 ? 64 : (x < -64 ? -64 :x));
if (y > 0 || y < 0) v = (y > 64 ? 64 : (y < -64 ? -64 :y));
if (h || v) {
scrolled = true;
usb_mouse_send(0,0, -v/16, h/16, 0);
_delay_ms(100);
}
} else if (!scrolled && (ps2_mouse_btn_prev & PS2_MOUSE_SCROLL_BUTTON)) {
usb_mouse_send(0,0,0,0, PS2_MOUSE_SCROLL_BUTTON);
_delay_ms(100);
usb_mouse_send(0,0,0,0, 0);
} else {
scrolled = false;
usb_mouse_send(x, y, 0, 0, ps2_mouse_btn & PS2_MOUSE_BTN_MASK);
}
ps2_mouse_btn_prev = (ps2_mouse_btn & PS2_MOUSE_BTN_MASK);
ps2_mouse_print();
}
ps2_mouse_x = 0;
ps2_mouse_y = 0;
ps2_mouse_btn = 0;
}
void ps2_mouse_print(void)
{
if (!debug_mouse) return;
print("ps2_mouse[btn|x y]: ");
phex(ps2_mouse_btn); print("|");
phex(ps2_mouse_x); print(" ");
phex(ps2_mouse_y); print("\n");
}