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/* sunmouse.c: Sun mouse driver for the Sparc

 *

 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)

 * Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)

 *

 * Parts based on the psaux.c driver written by:

 * Johan Myreen.

 *

 * Dec/19/95 Added SunOS mouse ioctls - miguel.

 * Jan/5/96  Added VUID support, sigio support - miguel.

 * Mar/5/96  Added proper mouse stream support - miguel.

 */

/* The mouse is run off of one of the Zilog serial ports.  On

 * that port is the mouse and the keyboard, each gets a zs channel.

 * The mouse itself is mouse-systems in nature.  So the protocol is:

 *

 * Byte 1) Button state which is bit-encoded as

 *            0x4 == left-button down, else up

 *            0x2 == middle-button down, else up

 *            0x1 == right-button down, else up

 *

 * Byte 2) Delta-x

 * Byte 3) Delta-y

 * Byte 4) Delta-x again

 * Byte 5) Delta-y again

 *

 * One day this driver will have to support more than one mouse in the system.

 *

 * This driver has two modes of operation: the default VUID_NATIVE is

 * set when the device is opened and allows the application to see the

 * mouse character stream as we get it from the serial (for gpm for

 * example).  The second method, VUID_FIRM_EVENT will provide cooked

 * events in Firm_event records.

 * */

#include <linux/kernel.h>

#include <linux/sched.h>

#include <linux/fcntl.h>

#include <linux/signal.h>

#include <linux/timer.h>

#include <linux/errno.h>

#include <linux/miscdevice.h>

#include <linux/mm.h>

#include <asm/segment.h>

#include <asm/system.h>

#include <asm/vuid_event.h>

#include <linux/random.h>

/* The following keeps track of software state for the Sun

 * mouse.

 */

#define STREAM_SIZE   2048

#define EV_SIZE       (STREAM_SIZE/sizeof (Firm_event))

#define BUTTON_LEFT   4

#define BUTTON_MIDDLE 2

#define BUTTON_RIGHT  1

struct sun_mouse {

        unsigned char transaction[5];  /* Each protocol transaction */

        unsigned char byte;            /* Counter, starts at 0 */

        unsigned char button_state;    /* Current button state */

        unsigned char prev_state;      /* Previous button state */

        int delta_x;                   /* Current delta-x */

        int delta_y;                   /* Current delta-y */

        int present;

        int ready;                     /* set if there if data is available */

        int active;                    /* set if device is open */

        int vuid_mode;                 /* VUID_NATIVE or VUID_FIRM_EVENT */

        struct wait_queue *proc_list;

        struct fasync_struct *fasync;

        /* The event/stream queue */

        unsigned int head;

        unsigned int tail;

        union {

                char stream [STREAM_SIZE];

                Firm_event ev [0];

        } queue;

};

static struct sun_mouse sunmouse;

#define gen_events (sunmouse.vuid_mode != VUID_NATIVE)

#define bstate sunmouse.button_state

#define pstate sunmouse.prev_state

extern void mouse_put_char(char ch);

/* #define SMOUSE_DEBUG */

static void

push_event (Firm_event *ev)

{

        int next = (sunmouse.head + 1) % EV_SIZE;

        if (next != sunmouse.tail){

                sunmouse.queue.ev [sunmouse.head] = *ev;

                sunmouse.head = next;

        }

}

static int

queue_empty (void)

{

        return sunmouse.head == sunmouse.tail;

}

static Firm_event *

get_from_queue (void)

{

        Firm_event *result;

        result = &sunmouse.queue.ev [sunmouse.tail];

        sunmouse.tail = (sunmouse.tail + 1) % EV_SIZE;

        return result;

}

static void

push_char (char c)

{

        int next = (sunmouse.head + 1) % STREAM_SIZE;

        if (next != sunmouse.tail){

                sunmouse.queue.stream [sunmouse.head] = c;

                sunmouse.head = next;

        }

        sunmouse.ready = 1;

        if (sunmouse.fasync)

                kill_fasync (sunmouse.fasync, SIGIO);

        wake_up_interruptible (&sunmouse.proc_list);

}

/* The following is called from the zs driver when bytes are received on

 * the Mouse zs8530 channel.

 */

void

sun_mouse_inbyte(unsigned char byte, unsigned char status)

{

        signed char mvalue;

        int d;

        Firm_event ev;

        add_mouse_randomness (byte);

        if(!sunmouse.active)

                return;

        if (!gen_events){

                push_char (byte);

                return;

        }

        /* Check for framing errors and parity errors */

        /* XXX TODO XXX */

        /* If the mouse sends us a byte from 0x80 to 0x87

         * we are starting at byte zero in the transaction

         * protocol.

         */

        if(byte >= 0x80 && byte <= 0x87)

                sunmouse.byte = 0;

        mvalue = (signed char) byte;

        switch(sunmouse.byte) {

        case 0:

                /* Button state */

                sunmouse.button_state = (~byte) & 0x7;

#ifdef SMOUSE_DEBUG

                printk("B<Left %s, Middle %s, Right %s>",

                       ((sunmouse.button_state & 0x4) ? "DOWN" : "UP"),

                       ((sunmouse.button_state & 0x2) ? "DOWN" : "UP"),

                       ((sunmouse.button_state & 0x1) ? "DOWN" : "UP"));

#endif

                sunmouse.byte++;

                return;

        case 1:

                /* Delta-x 1 */

#ifdef SMOUSE_DEBUG

                printk("DX1<%d>", mvalue);

#endif

                sunmouse.delta_x = mvalue;

                sunmouse.byte++;

                return;

        case 2:

                /* Delta-y 1 */

#ifdef SMOUSE_DEBUG

                printk("DY1<%d>", mvalue);

#endif

                sunmouse.delta_y = mvalue;

                sunmouse.byte++;

                return;

        case 3:

                /* Delta-x 2 */

#ifdef SMOUSE_DEBUG

                printk("DX2<%d>", mvalue);

#endif

                sunmouse.delta_x += mvalue;

                sunmouse.byte++;

                return;

        case 4:

                /* Last byte, Delta-y 2 */

#ifdef SMOUSE_DEBUG

                printk("DY2<%d>", mvalue);

#endif

                sunmouse.delta_y += mvalue;

                sunmouse.byte = 69;  /* Some ridiculous value */

                break;

        case 69:

                /* Until we get the (0x80 -> 0x87) value we aren't

                 * in the middle of a real transaction, so just

                 * return.

                 */

                return;

        default:

                printk("sunmouse: bogon transaction state\n");

                sunmouse.byte = 69;  /* What could cause this? */

                return;

        };

        d = bstate ^ pstate;

        pstate = bstate;

        if (d){

                if (d & BUTTON_LEFT){

                        ev.id = MS_LEFT;

                        ev.value = bstate & BUTTON_LEFT;

                }

                if (d & BUTTON_RIGHT){

                        ev.id = MS_RIGHT;

                        ev.value = bstate & BUTTON_RIGHT;

                }

                if (d & BUTTON_MIDDLE){

                        ev.id = MS_MIDDLE;

                        ev.value = bstate & BUTTON_MIDDLE;

                }

                ev.time = xtime;

                ev.value = ev.value ? VKEY_DOWN : VKEY_UP;

                push_event (&ev);

        }

        if (sunmouse.delta_x){

                ev.id = LOC_X_DELTA;

                ev.time = xtime;

                ev.value = sunmouse.delta_x;

                push_event (&ev);

                sunmouse.delta_x = 0;

        }

        if (sunmouse.delta_y){

                ev.id = LOC_Y_DELTA;

                ev.time = xtime;

                ev.value = sunmouse.delta_y;

                push_event (&ev);

        }

        /* We just completed a transaction, wake up whoever is awaiting

         * this event.

         */

        sunmouse.ready = 1;

        if (sunmouse.fasync)

                kill_fasync (sunmouse.fasync, SIGIO);

        wake_up_interruptible(&sunmouse.proc_list);

        return;

}

static int

sun_mouse_open(struct inode * inode, struct file * file)

{

        if(!sunmouse.present)

                return -EINVAL;

        if(sunmouse.active)

                return -EBUSY;

        sunmouse.active = 1;

        sunmouse.ready = sunmouse.delta_x = sunmouse.delta_y = 0;

        sunmouse.button_state = 0x80;

        sunmouse.vuid_mode = VUID_NATIVE;

        return 0;

}

static int

sun_mouse_fasync (struct inode *inode, struct file *filp, int on)

{

        int retval;

        retval = fasync_helper (inode, filp, on, &sunmouse.fasync);

        if (retval < 0)

                return retval;

        return 0;

}

static void

sun_mouse_close(struct inode *inode, struct file *file)

{

        sunmouse.active = sunmouse.ready = 0;

        sun_mouse_fasync (inode, file, 0);

}

static int

sun_mouse_write(struct inode *inode, struct file *file, const char *buffer,

                int count)

{

        return -EINVAL;  /* foo on you */

}

static int

sun_mouse_read(struct inode *inode, struct file *file, char *buffer,

               int count)

{

        struct wait_queue wait = { current, NULL };

        if (queue_empty ()){

                if (file->f_flags & O_NONBLOCK)

                        return -EWOULDBLOCK;

                add_wait_queue (&sunmouse.proc_list, &wait);

                while (queue_empty () && !(current->signal & ~current->blocked)){

                        current->state = TASK_INTERRUPTIBLE;

                        schedule ();

                }

                current->state = TASK_RUNNING;

                remove_wait_queue (&sunmouse.proc_list, &wait);

        }

        if (gen_events){

                char *p = buffer, *end = buffer+count;

                while (p < end && !queue_empty ()){

                        *(Firm_event *)p = *get_from_queue ();

                        p += sizeof (Firm_event);

                }

                sunmouse.ready = !queue_empty ();

                inode->i_atime = CURRENT_TIME;

                return p-buffer;

        } else {

                int c;

                for (c = count; !queue_empty () && c; c--){

                        *buffer++ = sunmouse.queue.stream [sunmouse.tail];

                        sunmouse.tail = (sunmouse.tail + 1) % STREAM_SIZE;

                }

                sunmouse.ready = !queue_empty ();

                inode->i_atime = CURRENT_TIME;

                return count-c;

        }

        /* Only called if nothing was sent */

        if (current->signal & ~current->blocked)

                return -ERESTARTSYS;

        return 0;

}

static int

sun_mouse_select(struct inode *inode, struct file *file, int sel_type,

                            select_table *wait)

{

        if(sel_type != SEL_IN)

                return 0;

        if(sunmouse.ready)

                return 1;

        select_wait(&sunmouse.proc_list, wait);

        return 0;

}

int

sun_mouse_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)

{

        int i;

        switch (cmd){

                /* VUIDGFORMAT - Get input device byte stream format */

        case _IOR('v', 2, int):

                i = verify_area (VERIFY_WRITE, (void *)arg, sizeof (int));

                if (i) return i;

                *(int *)arg = sunmouse.vuid_mode;

                break;

                /* VUIDSFORMAT - Set input device byte stream format*/

        case _IOW('v', 1, int):

                i = verify_area (VERIFY_READ, (void *)arg, sizeof (int));

                if (i) return i;

                i = *(int *) arg;

                if (i == VUID_NATIVE || i == VUID_FIRM_EVENT){

                        sunmouse.vuid_mode = *(int *)arg;

                        sunmouse.head = sunmouse.tail = 0;

                } else

                        return -EINVAL;

                break;

        default:

                printk ("[MOUSE-ioctl: %8.8x]\n", cmd);

                return -1;

        }

        return 0;

}

struct file_operations sun_mouse_fops = {

        NULL,

        sun_mouse_read,

        sun_mouse_write,

        NULL,

        sun_mouse_select,

        sun_mouse_ioctl,

        NULL,

        sun_mouse_open,

        sun_mouse_close,

        NULL,

        sun_mouse_fasync,

};

static struct miscdevice sun_mouse_mouse = {

        SUN_MOUSE_MINOR, "sunmouse", &sun_mouse_fops

};

int

sun_mouse_init(void)

{

        printk("Sun Mouse-Systems mouse driver version 1.00\n");

        sunmouse.present = 1;

        sunmouse.ready = sunmouse.active = 0;

        misc_register (&sun_mouse_mouse);

        sunmouse.delta_x = sunmouse.delta_y = 0;

        sunmouse.button_state = 0x80;

        sunmouse.proc_list = NULL;

        return 0;

}

void

sun_mouse_zsinit(void)

{

        sunmouse.ready = 1;

}