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/*

 * Logitech Bus Mouse Driver for Linux

 * by James Banks

 *

 * Mods by Matthew Dillon

 *   calls verify_area()

 *   tracks better when X is busy or paging

 *

 * Heavily modified by David Giller

 *   changed from queue- to counter- driven

 *   hacked out a (probably incorrect) mouse_select

 *

 * Modified again by Nathan Laredo to interface with

 *   0.96c-pl1 IRQ handling changes (13JUL92)

 *   didn't bother touching select code.

 *

 * Modified the select() code blindly to conform to the VFS

 *   requirements. 92.07.14 - Linus. Somebody should test it out.

 *

 * Modified by Johan Myreen to make room for other mice (9AUG92)

 *   removed assignment chr_fops[10] = &mouse_fops; see mouse.c

 *   renamed mouse_fops => bus_mouse_fops, made bus_mouse_fops public.

 *   renamed this file mouse.c => busmouse.c

 *

 * Minor addition by Cliff Matthews

 *   added fasync support

 *

 * Modularised 6-Sep-95 Philip Blundell <pjb27@cam.ac.uk>

 *

 * Replaced dumb busy loop with udelay()  16 Nov 95

 *   Nathan Laredo <laredo@gnu.ai.mit.edu>

 *

 * Track I/O ports with request_region().  12 Dec 95 Philip Blundell

 */

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/sched.h>

#include <linux/busmouse.h>

#include <linux/signal.h>

#include <linux/errno.h>

#include <linux/mm.h>

#include <linux/miscdevice.h>

#include <linux/random.h>

#include <linux/delay.h>

#include <linux/ioport.h>

#include <asm/io.h>

#include <asm/segment.h>

#include <asm/system.h>

#include <asm/irq.h>

static struct mouse_status mouse;

static int mouse_irq = MOUSE_IRQ;

void bmouse_setup(char *str, int *ints)

{

        if (ints[0] > 0)

                mouse_irq=ints[1];

}

static void mouse_interrupt(int irq, void *dev_id, struct pt_regs *regs)

{

        char dx, dy;

        unsigned char buttons;

        outb(MSE_READ_X_LOW, MSE_CONTROL_PORT);

        dx = (inb(MSE_DATA_PORT) & 0xf);

        outb(MSE_READ_X_HIGH, MSE_CONTROL_PORT);

        dx |= (inb(MSE_DATA_PORT) & 0xf) << 4;

        outb(MSE_READ_Y_LOW, MSE_CONTROL_PORT );

        dy = (inb(MSE_DATA_PORT) & 0xf);

        outb(MSE_READ_Y_HIGH, MSE_CONTROL_PORT);

        buttons = inb(MSE_DATA_PORT);

        dy |= (buttons & 0xf) << 4;

        buttons = ((buttons >> 5) & 0x07);

        if (dx != 0 || dy != 0 || buttons != mouse.buttons) {

          add_mouse_randomness((buttons << 16) + (dy << 8) + dx);

          mouse.buttons = buttons;

          mouse.dx += dx;

          mouse.dy -= dy;

          mouse.ready = 1;

          wake_up_interruptible(&mouse.wait);

          /*

           * keep dx/dy reasonable, but still able to track when X (or

           * whatever) must page or is busy (i.e. long waits between

           * reads)

           */

          if (mouse.dx < -2048)

              mouse.dx = -2048;

          if (mouse.dx >  2048)

              mouse.dx =  2048;

          if (mouse.dy < -2048)

              mouse.dy = -2048;

          if (mouse.dy >  2048)

              mouse.dy =  2048;

          if (mouse.fasyncptr)

              kill_fasync(mouse.fasyncptr, SIGIO);

        }

        MSE_INT_ON();

}

static int fasync_mouse(struct inode *inode, struct file *filp, int on)

{

        int retval;

        retval = fasync_helper(inode, filp, on, &mouse.fasyncptr);

        if (retval < 0)

                return retval;

        return 0;

}

/*

 * close access to the mouse

 */

static void close_mouse(struct inode * inode, struct file * file)

{

        fasync_mouse(inode, file, 0);

        if (--mouse.active)

                return;

        MSE_INT_OFF();

        free_irq(mouse_irq, NULL);

        MOD_DEC_USE_COUNT;

}

/*

 * open access to the mouse

 */

static int open_mouse(struct inode * inode, struct file * file)

{

        if (!mouse.present)

                return -EINVAL;

        if (mouse.active++)

                return 0;

        if (request_irq(mouse_irq, mouse_interrupt, 0, "busmouse", NULL)) {

                mouse.active--;

                return -EBUSY;

        }

        mouse.ready = 0;

        mouse.dx = 0;

        mouse.dy = 0;

        mouse.buttons = 0x87;

        MOD_INC_USE_COUNT;

        MSE_INT_ON();

        return 0;

}

/*

 * writes are disallowed

 */

static int write_mouse(struct inode * inode, struct file * file, const char * buffer, int count)

{

        return -EINVAL;

}

/*

 * read mouse data.  Currently never blocks.

 */

static int read_mouse(struct inode * inode, struct file * file, char * buffer, int count)

{

        int r;

        int dx;

        int dy;

        unsigned char buttons;

        /* long flags; */

        if (count < 3)

                return -EINVAL;

        if ((r = verify_area(VERIFY_WRITE, buffer, count)))

                return r;

        if (!mouse.ready)

                return -EAGAIN;

        /*

         * Obtain the current mouse parameters and limit as appropriate for

         * the return data format.  Interrupts are only disabled while

         * obtaining the parameters, NOT during the puts_fs_byte() calls,

         * so paging in put_user() does not effect mouse tracking.

         */

        /* save_flags(flags); cli(); */

        disable_irq(mouse_irq);

        dx = mouse.dx;

        dy = mouse.dy;

        if (dx < -127)

            dx = -127;

        if (dx > 127)

            dx = 127;

        if (dy < -127)

            dy = -127;

        if (dy > 127)

            dy = 127;

        buttons = mouse.buttons;

        mouse.dx -= dx;

        mouse.dy -= dy;

        mouse.ready = 0;

        enable_irq(mouse_irq);

        /* restore_flags(flags); */

        put_user(buttons | 0x80, buffer);

        put_user((char)dx, buffer + 1);

        put_user((char)dy, buffer + 2);

        for (r = 3; r < count; r++)

            put_user(0x00, buffer + r);

        return r;

}

/*

 * select for mouse input

 */

static int mouse_select(struct inode *inode, struct file *file, int sel_type, select_table * wait)

{

        if (sel_type == SEL_IN) {

                if (mouse.ready)

                        return 1;

                select_wait(&mouse.wait, wait);

        }

        return 0;

}

struct file_operations bus_mouse_fops = {

        NULL,           /* mouse_seek */

        read_mouse,

        write_mouse,

        NULL,           /* mouse_readdir */

        mouse_select,   /* mouse_select */

        NULL,           /* mouse_ioctl */

        NULL,           /* mouse_mmap */

        open_mouse,

        close_mouse,

        NULL,

        fasync_mouse,

};

static struct miscdevice bus_mouse = {

        LOGITECH_BUSMOUSE, "busmouse", &bus_mouse_fops

};

int bus_mouse_init(void)

{

        if (check_region(LOGIBM_BASE, LOGIBM_EXTENT)) {

          mouse.present = 0;

          return -EIO;

        }

        outb(MSE_CONFIG_BYTE, MSE_CONFIG_PORT);

        outb(MSE_SIGNATURE_BYTE, MSE_SIGNATURE_PORT);

        udelay(100L);   /* wait for reply from mouse */

        if (inb(MSE_SIGNATURE_PORT) != MSE_SIGNATURE_BYTE) {

                mouse.present = 0;

                return -EIO;

        }

        outb(MSE_DEFAULT_MODE, MSE_CONFIG_PORT);

        MSE_INT_OFF();

        request_region(LOGIBM_BASE, LOGIBM_EXTENT, "busmouse");

        mouse.present = 1;

        mouse.active = 0;

        mouse.ready = 0;

        mouse.buttons = 0x87;

        mouse.dx = 0;

        mouse.dy = 0;

        mouse.wait = NULL;

        printk(KERN_INFO "Logitech bus mouse detected, using IRQ %d.\n",

               mouse_irq);

        misc_register(&bus_mouse);

        return 0;

}

#ifdef MODULE

int init_module(void)

{

        return bus_mouse_init();

}

void cleanup_module(void)

{

        misc_deregister(&bus_mouse);

        release_region(LOGIBM_BASE, LOGIBM_EXTENT);

}

#endif