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#include <cpu/idt.h>
#include <drivers/mouse.h>
#include <errno.h>
#include <fs/devfs.h>
#include <fs/fifo.h>
#include <fs/vfs.h>
#include <interrupts.h>
#include <math.h>
#include <typedefs.h>
u8 mouse_cycle = 0;
u8 mouse_u8[3];
int mouse_x = 0;
int mouse_y = 0;
u8 mouse_left_button = 0;
u8 mouse_middle_button = 0;
u8 mouse_right_button = 0;
vfs_inode_t *mouse_inode = NULL;
struct mouse_event {
u8 buttons;
int x;
int y;
};
struct mouse_event previous_event = {
.buttons = 0,
.x = 0,
.y = 0,
};
int fs_mouse_has_data(vfs_inode_t *inode) {
if (mouse_x != previous_event.x || mouse_y != previous_event.y) {
return 1;
}
const struct ringbuffer *rb = inode->internal_object;
return !ringbuffer_isempty(rb);
}
int fs_mouse_read(u8 *buffer, u64 offset, u64 len, vfs_fd_t *fd) {
mouse_middle_button = mouse_u8[0] & (1 << 2);
mouse_right_button = mouse_u8[0] & (1 << 1);
mouse_left_button = mouse_u8[0] & (1 << 0);
struct ringbuffer *rb = fd->inode->internal_object;
u32 rc = ringbuffer_read(rb, buffer, len);
if (0 == rc && len > 0) {
if (mouse_x != previous_event.x || mouse_y != previous_event.y) {
int read_len = min(len, sizeof(struct mouse_event));
struct mouse_event e;
e.x = mouse_x;
e.y = mouse_y;
e.buttons = 0;
if (mouse_middle_button) {
e.buttons |= (1 << 2);
}
if (mouse_right_button) {
e.buttons |= (1 << 1);
}
if (mouse_left_button) {
e.buttons |= (1 << 0);
}
memcpy(buffer, &e, read_len);
previous_event = e;
return read_len;
}
return -EAGAIN;
}
return rc;
}
void add_mouse(void) {
mouse_inode =
devfs_add_file("/mouse", fs_mouse_read, NULL, NULL, fs_mouse_has_data,
always_can_write, FS_TYPE_CHAR_DEVICE);
mouse_inode->internal_object = kmalloc(sizeof(struct ringbuffer));
ringbuffer_init(mouse_inode->internal_object, 4096);
}
void int_mouse(reg_t *r) {
(void)r;
switch (mouse_cycle) {
case 0:
mouse_u8[0] = inb(0x60);
if (!(mouse_u8[0] & (1 << 3))) {
mouse_cycle = 0;
break;
}
mouse_cycle++;
break;
case 1:
mouse_u8[1] = inb(0x60);
mouse_cycle++;
break;
case 2: {
mouse_u8[2] = inb(0x60);
int16_t x = mouse_u8[1];
int16_t y = mouse_u8[2];
uint8_t xs = mouse_u8[0] & (1 << 4);
uint8_t ys = mouse_u8[0] & (1 << 5);
if (xs)
x |= 0xFF00;
if (ys)
y |= 0xFF00;
mouse_x += x;
mouse_y -= y;
if (mouse_x < 0)
mouse_x = 0;
if (mouse_y < 0)
mouse_y = 0;
mouse_middle_button = mouse_u8[0] & (1 << 2);
mouse_right_button = mouse_u8[0] & (1 << 1);
mouse_left_button = mouse_u8[0] & (1 << 0);
mouse_cycle = 0;
// If there is a change in the mouse buttons that event should be written.
// The mouse movements will be generated upon request. This avoids
// filling the ringbuffer with a ton of small mouse movements.
int button_change = 0;
if (mouse_middle_button != (previous_event.buttons & (1 << 2))) {
button_change = 1;
} else if (mouse_right_button != (previous_event.buttons & (1 << 1))) {
button_change = 1;
} else if (mouse_left_button != (previous_event.buttons & (1 << 0))) {
button_change = 1;
}
if (!button_change) {
break;
}
struct mouse_event e;
e.buttons = mouse_u8[0];
e.x = mouse_x;
e.y = mouse_y;
previous_event = e;
if (mouse_inode) {
struct ringbuffer *rb = mouse_inode->internal_object;
ringbuffer_write(rb, (u8 *)&e, sizeof(e));
}
break;
}
}
EOI(0xC);
}
void mouse_wait(u8 a_type) {
u32 _time_out = 100000;
if (a_type == 0) {
while (_time_out--) {
if ((inb(0x64) & 1) == 1) {
return;
}
}
return;
} else {
while (_time_out--) {
if ((inb(0x64) & 2) == 0) {
return;
}
}
return;
}
}
void mouse_write(u8 a_write) {
// Wait to be able to send a command
mouse_wait(1);
// Tell the mouse we are sending a command
outb(0x64, 0xD4);
// Wait for the final part
mouse_wait(1);
// Finally write
outb(0x60, a_write);
}
u8 mouse_read() {
mouse_wait(0);
return inb(0x60);
}
void install_mouse(void) {
u8 _status;
disable_interrupts();
// Enable the auxiliary mouse device
mouse_wait(1);
outb(0x64, 0xA8);
// Enable the interrupts
mouse_wait(1);
outb(0x64, 0x20);
mouse_wait(0);
_status = (inb(0x60) | 2);
mouse_wait(1);
outb(0x64, 0x60);
mouse_wait(1);
outb(0x60, _status);
// Tell the mouse to use default settings
mouse_write(0xF6);
mouse_read(); // Acknowledge
// Enable the mouse
mouse_write(0xF4);
mouse_read(); // Acknowledge
install_handler((interrupt_handler)int_mouse, INT_32_INTERRUPT_GATE(0x3),
0x2C);
irq_clear_mask(0x2);
}
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