107 lines
3.0 KiB
C
107 lines
3.0 KiB
C
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/*
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* ps2mouse.c:
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* PS/2 mouse device driver for NewOS and OpenBeOS.
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* Author: Elad Lahav (elad@eldarshany.com)
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* Created: 21.12.2001
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* Modified: 11.1.2002
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*/
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/*
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* A PS/2 mouse is connected to the IBM 8042 controller, and gets its
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* name from the IBM PS/2 personal computer, which was the first to
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* use this device. All resources are shared between the keyboard, and
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* the mouse, referred to as the "Auxiliary Device".
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* I/O:
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* ~~~
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* The controller has 3 I/O registers:
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* 1. Status (input), mapped to port 64h
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* 2. Control (output), mapped to port 64h
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* 3. Data (input/output), mapped to port 60h
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* Data:
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* ~~~~
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* Since a mouse is an input only device, data can only be read, and
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* not written. A packet read from the mouse data port is composed of
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* three bytes:
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* byte 0: status byte, where
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* - bit 0: Y overflow (1 = true)
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* - bit 1: X overflow (1 = true)
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* - bit 2: MSB of Y offset
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* - bit 3: MSB of X offset
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* - bit 4: Syncronization bit (always 1)
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* - bit 5: Middle button (1 = down)
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* - bit 6: Right button (1 = down)
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* - bit 7: Left button (1 = down)
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* byte 1: X position change, since last probed (-127 to +127)
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* byte 2: Y position change, since last probed (-127 to +127)
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* Interrupts:
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* ~~~~~~~~~~
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* The PS/2 mouse device is connected to interrupt 12, which means that
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* it uses the second interrupt controller (handles INT8 to INT15). In
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* order for this interrupt to be enabled, both the 5th interrupt of
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* the second controller AND the 3rd interrupt of the first controller
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* (cascade mode) should be unmasked.
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* The controller uses 3 consecutive interrupts to inform the computer
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* that it has new data. On the first the data register holds the status
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* byte, on the second the X offset, and on the 3rd the Y offset.
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*/
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#ifndef _KERNEL_ARCH_x86_PS2MOUSE_H
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#define _KERNEL_ARCH_x86_PS2MOUSE_H
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#include <kernel.h>
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#include <memheap.h>
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#include <int.h>
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#include <debug.h>
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#include <devfs.h>
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#include <arch/int.h>
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#include <OS.h>
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#include <string.h>
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/////////////////////////////////////////////////////////////////////////
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// definitions
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// I/O addresses
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#define PS2_PORT_DATA 0x60
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#define PS2_PORT_CTRL 0x64
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// control words
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#define PS2_CTRL_WRITE_CMD 0x60
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#define PS2_CTRL_WRITE_AUX 0xD4
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// data words
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#define PS2_CMD_DEV_INIT 0x43
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#define PS2_CMD_ENABLE_MOUSE 0xF4
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#define PS2_CMD_DISABLE_MOUSE 0xF5
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#define PS2_CMD_RESET_MOUSE 0xFF
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#define PS2_RES_ACK 0xFA
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#define PS2_RES_RESEND 0xFE
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// interrupts
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#define INT_BASE 0x20
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#define INT_PS2_MOUSE 0x0C
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#define INT_CASCADE 0x02
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#define PACKET_SIZE 3
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/*
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* mouse_data:
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* Holds the data read from the PS/2 auxiliary device.
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*/
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typedef struct {
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char status;
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char delta_x;
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char delta_y;
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} mouse_data; // mouse_data
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#ifdef _PS2MOUSE_
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static mouse_data md_int;
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static mouse_data md_read;
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static sem_id mouse_sem;
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static bool in_read;
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#endif
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int mouse_dev_init(kernel_args *ka);
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#endif /* _KERNEL_ARCH_x86_PS2MOUSE_H */
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