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/*
 * PS/2 mouse driver
 *
 * Copyright (c) 1999-2002 Vojtech Pavlik
 */

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */

#include <linuxcomp.h>

#include <linux/delay.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/init.h>
#include <linux/pm.h>
#include "psmouse.h"
//#include "synaptics.h"
#include "logips2pp.h"

MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
MODULE_DESCRIPTION("PS/2 mouse driver");
MODULE_PARM(psmouse_noext, "1i");
MODULE_PARM_DESC(psmouse_noext, "Disable any protocol extensions. Useful for KVM switches.");
MODULE_PARM(psmouse_resolution, "i");
MODULE_PARM_DESC(psmouse_resolution, "Resolution, in dpi.");
MODULE_PARM(psmouse_rate, "i");
MODULE_PARM_DESC(psmouse_rate, "Report rate, in reports per second.");
MODULE_PARM(psmouse_smartscroll, "i");
MODULE_PARM_DESC(psmouse_smartscroll, "Logitech Smartscroll autorepeat, 1 = enabled (default), 0 = disabled.");
MODULE_PARM(psmouse_resetafter, "i");
MODULE_PARM_DESC(psmouse_resetafter, "Reset Synaptics Touchpad after so many bad packets (0 = never).");
MODULE_LICENSE("GPL");

static int psmouse_noext;
int psmouse_resolution = 200;
unsigned int psmouse_rate = 100;
int psmouse_smartscroll = 1;
unsigned int psmouse_resetafter;

static char *psmouse_protocols[] = { "None", "PS/2", "PS2++", "PS2T++", "GenPS/2", "ImPS/2", "ImExPS/2", "SynPS/2"};

/*
 * psmouse_process_packet() analyzes the PS/2 mouse packet contents and
 * reports relevant events to the input module.
 */

static void psmouse_process_packet(struct psmouse *psmouse, struct pt_regs *regs)
{
        struct input_dev *dev = &psmouse->dev;
        unsigned char *packet = psmouse->packet;

        input_regs(dev, regs);

/*
 * The PS2++ protocol is a little bit complex
 */

        if (psmouse->type == PSMOUSE_PS2PP || psmouse->type == PSMOUSE_PS2TPP)
                ps2pp_process_packet(psmouse);

/*
 * Scroll wheel on IntelliMice, scroll buttons on NetMice
 */

        if (psmouse->type == PSMOUSE_IMPS || psmouse->type == PSMOUSE_GENPS)
                input_report_rel(dev, REL_WHEEL, -(signed char) packet[3]);

/*
 * Scroll wheel and buttons on IntelliMouse Explorer
 */

        if (psmouse->type == PSMOUSE_IMEX) {
                input_report_rel(dev, REL_WHEEL, (int) (packet[3] & 8) - (int) (packet[3] & 7));
                input_report_key(dev, BTN_SIDE, (packet[3] >> 4) & 1);
                input_report_key(dev, BTN_EXTRA, (packet[3] >> 5) & 1);
        }

/*
 * Extra buttons on Genius NewNet 3D
 */

        if (psmouse->type == PSMOUSE_GENPS) {
                input_report_key(dev, BTN_SIDE, (packet[0] >> 6) & 1);
                input_report_key(dev, BTN_EXTRA, (packet[0] >> 7) & 1);
        }

/*
 * Generic PS/2 Mouse
 */

        input_report_key(dev, BTN_LEFT,    packet[0]       & 1);
        input_report_key(dev, BTN_MIDDLE, (packet[0] >> 2) & 1);
        input_report_key(dev, BTN_RIGHT,  (packet[0] >> 1) & 1);

        input_report_rel(dev, REL_X, packet[1] ? (int) packet[1] - (int) ((packet[0] << 4) & 0x100) : 0);
        input_report_rel(dev, REL_Y, packet[2] ? (int) ((packet[0] << 3) & 0x100) - (int) packet[2] : 0);

        input_sync(dev);
}

/*
 * psmouse_interrupt() handles incoming characters, either gathering them into
 * packets or passing them to the command routine as command output.
 */

static irqreturn_t psmouse_interrupt(struct serio *serio,
                unsigned char data, unsigned int flags, struct pt_regs *regs)
{
        struct psmouse *psmouse = serio->private;

        if (psmouse->state == PSMOUSE_IGNORE)
                goto out;

        if (psmouse->acking) {
                switch (data) {
                        case PSMOUSE_RET_ACK:
                                psmouse->ack = 1;
                                break;
                        case PSMOUSE_RET_NAK:
                                psmouse->ack = -1;
                                break;
                        default:
                                psmouse->ack = 1;       /* Workaround for mice which don't ACK the Get ID command */
                                if (psmouse->cmdcnt)
                                        psmouse->cmdbuf[--psmouse->cmdcnt] = data;
                                break;
                }
                psmouse->acking = 0;
                goto out;
        }

        if (psmouse->cmdcnt) {
                psmouse->cmdbuf[--psmouse->cmdcnt] = data;
                goto out;
        }

        if (psmouse->pktcnt && time_after(jiffies26, psmouse->last + HZ/2)) {
                printk(KERN_WARNING "psmouse.c: %s at %s lost synchronization, throwing %d bytes away.\n",
                       psmouse->name, psmouse->phys, psmouse->pktcnt);
                psmouse->pktcnt = 0;
        }

        psmouse->last = jiffies26;
        psmouse->packet[psmouse->pktcnt++] = data;

        if (psmouse->packet[0] == PSMOUSE_RET_BAT) {
                if (psmouse->pktcnt == 1)
                        goto out;
               
                if (psmouse->pktcnt == 2) {
                        if (psmouse->packet[1] == PSMOUSE_RET_ID) {
                                psmouse->state = PSMOUSE_IGNORE;
                                serio_rescan(serio);
                                goto out;
                        }
                        if (psmouse->type == PSMOUSE_SYNAPTICS) {
                                /* neither 0xAA nor 0x00 are valid first bytes
                                 * for a packet in absolute mode
                                 */
                                psmouse->pktcnt = 0;
                                goto out;
                        }
                }
        }

        if (psmouse->type == PSMOUSE_SYNAPTICS) {
                /*
                 * The synaptics driver has its own resync logic,
                 * so it needs to receive all bytes one at a time.
                 */
                //!!!synaptics_process_byte(psmouse, regs);
                goto out;
        }

        if (psmouse->pktcnt == 3 + (psmouse->type >= PSMOUSE_GENPS)) {
                psmouse_process_packet(psmouse, regs);
                psmouse->pktcnt = 0;
                goto out;
        }
out:
        return IRQ_HANDLED;
}

/*
 * psmouse_sendbyte() sends a byte to the mouse, and waits for acknowledge.
 * It doesn't handle retransmission, though it could - because when there would
 * be need for retransmissions, the mouse has to be replaced anyway.
 */

static int psmouse_sendbyte(struct psmouse *psmouse, unsigned char byte)
{
        int timeout = 10000; /* 100 msec */
        psmouse->ack = 0;
        psmouse->acking = 1;

        if (serio_write(psmouse->serio, byte)) {
                psmouse->acking = 0;
                return -1;
        }

        while (!psmouse->ack && timeout--) udelay(10);

        return -(psmouse->ack <= 0);
}

/*
 * psmouse_command() sends a command and its parameters to the mouse,
 * then waits for the response and puts it in the param array.
 */

int psmouse_command(struct psmouse *psmouse, unsigned char *param, int command)
{
        int timeout = 500000; /* 500 msec */
        int send = (command >> 12) & 0xf;
        int receive = (command >> 8) & 0xf;
        int i;

        psmouse->cmdcnt = receive;

        if (command == PSMOUSE_CMD_RESET_BAT)
                timeout = 4000000; /* 4 sec */

        if (command & 0xff)
                if (psmouse_sendbyte(psmouse, command & 0xff))
                        return (psmouse->cmdcnt = 0) - 1;

        for (i = 0; i < send; i++)
                if (psmouse_sendbyte(psmouse, param[i]))
                        return (psmouse->cmdcnt = 0) - 1;

        while (psmouse->cmdcnt && timeout--) {
       
                if (psmouse->cmdcnt == 1 && command == PSMOUSE_CMD_RESET_BAT)
                        timeout = 100000;

                if (psmouse->cmdcnt == 1 && command == PSMOUSE_CMD_GETID &&
                    psmouse->cmdbuf[1] != 0xab && psmouse->cmdbuf[1] != 0xac) {
                        psmouse->cmdcnt = 0;
                        break;
                }

                udelay(1);
        }

        for (i = 0; i < receive; i++)
                param[i] = psmouse->cmdbuf[(receive - 1) - i];

        if (psmouse->cmdcnt)
                return (psmouse->cmdcnt = 0) - 1;

        return 0;
}

/*
 * psmouse_extensions() probes for any extensions to the basic PS/2 protocol
 * the mouse may have.
 */

static int psmouse_extensions(struct psmouse *psmouse)
{
        unsigned char param[4];

        param[0] = 0;
        psmouse->vendor = "Generic";
        psmouse->name = "Mouse";
        psmouse->model = 0;

        if (psmouse_noext)
                return PSMOUSE_PS2;

/*
 * Try Synaptics TouchPad magic ID
 */

       /*param[0] = 0;
       psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
       psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
       psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
       psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
       psmouse_command(psmouse, param, PSMOUSE_CMD_GETINFO);

       if (param[1] == 0x47) {
                psmouse->vendor = "Synaptics";
                psmouse->name = "TouchPad";
                if (!synaptics_init(psmouse))
                        return PSMOUSE_SYNAPTICS;
                else
                        return PSMOUSE_PS2;
       }*/

/*
 * Try Genius NetMouse magic init.
 */

        param[0] = 3;
        psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
        psmouse_command(psmouse,  NULL, PSMOUSE_CMD_SETSCALE11);
        psmouse_command(psmouse,  NULL, PSMOUSE_CMD_SETSCALE11);
        psmouse_command(psmouse,  NULL, PSMOUSE_CMD_SETSCALE11);
        psmouse_command(psmouse, param, PSMOUSE_CMD_GETINFO);

        if (param[0] == 0x00 && param[1] == 0x33 && param[2] == 0x55) {

                set_bit(BTN_EXTRA, psmouse->dev.keybit);
                set_bit(BTN_SIDE, psmouse->dev.keybit);
                set_bit(REL_WHEEL, psmouse->dev.relbit);

                psmouse->vendor = "Genius";
                psmouse->name = "Wheel Mouse";
                return PSMOUSE_GENPS;
        }

/*
 * Try Logitech magic ID.
 */

        param[0] = 0;
        psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
        psmouse_command(psmouse,  NULL, PSMOUSE_CMD_SETSCALE11);
        psmouse_command(psmouse,  NULL, PSMOUSE_CMD_SETSCALE11);
        psmouse_command(psmouse,  NULL, PSMOUSE_CMD_SETSCALE11);
        param[1] = 0;
        psmouse_command(psmouse, param, PSMOUSE_CMD_GETINFO);

        if (param[1]) {
                int type = ps2pp_detect_model(psmouse, param);
                if (type)
                        return type;
        }

/*
 * Try IntelliMouse magic init.
 */

        param[0] = 200;
        psmouse_command(psmouse, param, PSMOUSE_CMD_SETRATE);
        param[0] = 100;
        psmouse_command(psmouse, param, PSMOUSE_CMD_SETRATE);
        param[0] =  80;
        psmouse_command(psmouse, param, PSMOUSE_CMD_SETRATE);
        psmouse_command(psmouse, param, PSMOUSE_CMD_GETID);
       
        if (param[0] == 3) {

                set_bit(REL_WHEEL, psmouse->dev.relbit);

/*
 * Try IntelliMouse/Explorer magic init.
 */

                param[0] = 200;
                psmouse_command(psmouse, param, PSMOUSE_CMD_SETRATE);
                param[0] = 200;
                psmouse_command(psmouse, param, PSMOUSE_CMD_SETRATE);
                param[0] =  80;
                psmouse_command(psmouse, param, PSMOUSE_CMD_SETRATE);
                psmouse_command(psmouse, param, PSMOUSE_CMD_GETID);

                if (param[0] == 4) {

                        set_bit(BTN_SIDE, psmouse->dev.keybit);
                        set_bit(BTN_EXTRA, psmouse->dev.keybit);

                        psmouse->name = "Explorer Mouse";
                        return PSMOUSE_IMEX;
                }

                psmouse->name = "Wheel Mouse";
                return PSMOUSE_IMPS;
        }

/*
 * Okay, all failed, we have a standard mouse here. The number of the buttons
 * is still a question, though. We assume 3.
 */

        return PSMOUSE_PS2;
}

/*
 * psmouse_probe() probes for a PS/2 mouse.
 */

static int psmouse_probe(struct psmouse *psmouse)
{
        unsigned char param[2];

/*
 * First, we check if it's a mouse. It should send 0x00 or 0x03
 * in case of an IntelliMouse in 4-byte mode or 0x04 for IM Explorer.
 */

        param[0] = param[1] = 0xa5;

        if (psmouse_command(psmouse, param, PSMOUSE_CMD_GETID))
                return -1;

        if (param[0] != 0x00 && param[0] != 0x03 && param[0] != 0x04)
                return -1;

/*
 * Then we reset and disable the mouse so that it doesn't generate events.
 */

        if (psmouse_command(psmouse, NULL, PSMOUSE_CMD_RESET_DIS))
                return -1;

/*
 * And here we try to determine if it has any extensions over the
 * basic PS/2 3-button mouse.
 */

        return psmouse->type = psmouse_extensions(psmouse);
}

/*
 * Here we set the mouse resolution.
 */

static void psmouse_set_resolution(struct psmouse *psmouse)
{
        unsigned char param[1];

        if (psmouse->type == PSMOUSE_PS2PP && psmouse_resolution > 400) {
                ps2pp_set_800dpi(psmouse);
                return;
        }

        if (!psmouse_resolution || psmouse_resolution >= 200)
                param[0] = 3;
        else if (psmouse_resolution >= 100)
                param[0] = 2;
        else if (psmouse_resolution >= 50)
                param[0] = 1;
        else if (psmouse_resolution)
                param[0] = 0;

        psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
}

/*
 * Here we set the mouse report rate.
 */

static void psmouse_set_rate(struct psmouse *psmouse)
{
        unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10, 0 };
        int i = 0;

        while (rates[i] > psmouse_rate) i++;
        psmouse_command(psmouse, rates + i, PSMOUSE_CMD_SETRATE);
}

/*
 * psmouse_initialize() initializes the mouse to a sane state.
 */

static void psmouse_initialize(struct psmouse *psmouse)
{
        unsigned char param[2];
       
/*
 * We set the mouse report rate, resolution and scaling.
 */

        if (!psmouse_noext) {
                psmouse_set_rate(psmouse);
                psmouse_set_resolution(psmouse);
                psmouse_command(psmouse,  NULL, PSMOUSE_CMD_SETSCALE11);
        }

/*
 * We set the mouse into streaming mode.
 */

        psmouse_command(psmouse, param, PSMOUSE_CMD_SETSTREAM);
}

/*
 * psmouse_activate() enables the mouse so that we get motion reports from it.
 */

static void psmouse_activate(struct psmouse *psmouse)
{
        if (psmouse_command(psmouse, NULL, PSMOUSE_CMD_ENABLE))
                printk(KERN_WARNING "psmouse.c: Failed to enable mouse on %s\n", psmouse->serio->phys);

        psmouse->state = PSMOUSE_ACTIVATED;
}

/*
 * psmouse_cleanup() resets the mouse into power-on state.
 */

static void psmouse_cleanup(struct serio *serio)
{
        struct psmouse *psmouse = serio->private;
        unsigned char param[2];
        psmouse_command(psmouse, param, PSMOUSE_CMD_RESET_BAT);
}

/*
 * psmouse_disconnect() closes and frees.
 */

static void psmouse_disconnect(struct serio *serio)
{
        struct psmouse *psmouse = serio->private;

        psmouse->state = PSMOUSE_IGNORE;
        //!!!synaptics_disconnect(psmouse);
        input_unregister_device(&psmouse->dev);
        serio_close(serio);
        kfree(psmouse);
}

/*
 * Reinitialize mouse hardware after software suspend.
 */

static int psmouse_pm_callback(struct pm_dev *dev, pm_request_t request, void *data)
{
        struct psmouse *psmouse = dev->data;
        struct serio_dev *ser_dev = psmouse->serio->dev;

        //!!!synaptics_disconnect(psmouse);

        /* We need to reopen the serio port to reinitialize the i8042 controller */
        serio_close(psmouse->serio);
        serio_open(psmouse->serio, ser_dev);

        /* Probe and re-initialize the mouse */
        psmouse_probe(psmouse);
        psmouse_initialize(psmouse);
        //!!!synaptics_pt_init(psmouse);
        psmouse_activate(psmouse);

        return 0;
}

/*
 * psmouse_connect() is a callback from the serio module when
 * an unhandled serio port is found.
 */

static void psmouse_connect(struct serio *serio, struct serio_dev *dev)
{
        struct psmouse *psmouse;
        struct pm_dev *pmdev;
       
        if ((serio->type & SERIO_TYPE) != SERIO_8042 &&
            (serio->type & SERIO_TYPE) != SERIO_PS_PSTHRU)
                return;

        if (!(psmouse = kmalloc(sizeof(struct psmouse), GFP_KERNEL)))
                return;

        memset(psmouse, 0, sizeof(struct psmouse));

        init_input_dev(&psmouse->dev);
        psmouse->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_REL);
        psmouse->dev.keybit[LONG(BTN_MOUSE)] = BIT(BTN_LEFT) | BIT(BTN_MIDDLE) | BIT(BTN_RIGHT);
        psmouse->dev.relbit[0] = BIT(REL_X) | BIT(REL_Y);

        psmouse->state = PSMOUSE_NEW_DEVICE;
        psmouse->serio = serio;
        psmouse->dev.private = psmouse;

        serio->private = psmouse;

        if (serio_open(serio, dev)) {
                kfree(psmouse);
                return;
        }

        if (psmouse_probe(psmouse) <= 0) {
                serio_close(serio);
                kfree(psmouse);
                return;
        }
       
        pmdev = pm_register(PM_SYS_DEV, PM_SYS_UNKNOWN, psmouse_pm_callback);
        if (pmdev) {
                psmouse->dev.pm_dev = pmdev;
                pmdev->data = psmouse;
        }

        sprintf26(psmouse->devname, "%s %s %s",
                psmouse_protocols[psmouse->type], psmouse->vendor, psmouse->name);
        sprintf26(psmouse->phys, "%s/input0",
                serio->phys);

        psmouse->dev.name = psmouse->devname;
        psmouse->dev.phys = psmouse->phys;
        psmouse->dev.id.bustype = BUS_I8042;
        psmouse->dev.id.vendor = 0x0002;
        psmouse->dev.id.product = psmouse->type;
        psmouse->dev.id.version = psmouse->model;

        input_register_device(&psmouse->dev);
       
        printk(KERN_INFO "input: %s on %s\n", psmouse->devname, serio->phys);

        psmouse_initialize(psmouse);

        //!!!synaptics_pt_init(psmouse);

        psmouse_activate(psmouse);
}

static struct serio_dev psmouse_dev = {
        .interrupt =    psmouse_interrupt,
        .connect =      psmouse_connect,
        .disconnect =   psmouse_disconnect,
        .cleanup =      psmouse_cleanup,
};

#ifndef MODULE
static int __init psmouse_noext_setup(char *str)
{
        psmouse_noext = 1;
        return 1;
}

static int __init psmouse_resolution_setup(char *str)
{
        get_option(&str, &psmouse_resolution);
        return 1;
}

static int __init psmouse_smartscroll_setup(char *str)
{
        get_option(&str, &psmouse_smartscroll);
        return 1;
}

static int __init psmouse_resetafter_setup(char *str)
{
        get_option(&str, &psmouse_resetafter);
        return 1;
}

static int __init psmouse_rate_setup(char *str)
{
        get_option(&str, &psmouse_rate);
        return 1;
}

__setup("psmouse_noext", psmouse_noext_setup);
__setup("psmouse_resolution=", psmouse_resolution_setup);
__setup("psmouse_smartscroll=", psmouse_smartscroll_setup);
__setup("psmouse_resetafter=", psmouse_resetafter_setup);
__setup("psmouse_rate=", psmouse_rate_setup);

#endif

int __init psmouse_init(void)
{
        serio_register_device(&psmouse_dev);
        return 0;
}

void __exit psmouse_exit(void)
{
        serio_unregister_device(&psmouse_dev);
}

module_init(psmouse_init);
module_exit(psmouse_exit);