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/*

 * $Id: cobra.c,v 1.19 2002/01/22 20:26:52 vojtech Exp $

 *

 *  Copyright (c) 1999-2001 Vojtech Pavlik

 */

/*

 * Creative Labs Blaster GamePad Cobra driver for Linux

 */

/*

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 *

 * Should you need to contact me, the author, you can do so either by

 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:

 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic

 */

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/init.h>

#include <linux/gameport.h>

#include <linux/input.h>

#include <linux/jiffies.h>

#define DRIVER_DESC     "Creative Labs Blaster GamePad Cobra driver"

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");

MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL");

#define COBRA_MAX_STROBE        45      /* 45 us max wait for first strobe */

#define COBRA_LENGTH            36

static int cobra_btn[] = { BTN_START, BTN_SELECT, BTN_TL, BTN_TR, BTN_X, BTN_Y, BTN_Z, BTN_A, BTN_B, BTN_C, BTN_TL2, BTN_TR2, 0 };

struct cobra {

        struct gameport *gameport;

        struct input_dev *dev[2];

        int reads;

        int bads;

        unsigned char exists;

        char phys[2][32];

};

static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data)

{

        unsigned long flags;

        unsigned char u, v, w;

        __u64 buf[2];

        int r[2], t[2];

        int i, j, ret;

        int strobe = gameport_time(gameport, COBRA_MAX_STROBE);

        for (i = 0; i < 2; i++) {

                r[i] = buf[i] = 0;

                t[i] = COBRA_MAX_STROBE;

        }

        local_irq_save(flags);

        u = gameport_read(gameport);

        do {

                t[0]--; t[1]--;

                v = gameport_read(gameport);

                for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2)

                        if (w & 0x30) {

                                if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) {

                                        buf[i] |= (__u64)((w >> 5) & 1) << r[i]++;

                                        t[i] = strobe;

                                        u = v;

                                } else t[i] = 0;

                        }

        } while (t[0] > 0 || t[1] > 0);

        local_irq_restore(flags);

        ret = 0;

        for (i = 0; i < 2; i++) {

                if (r[i] != COBRA_LENGTH) continue;

                for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++)

                        buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1));

                if (j < COBRA_LENGTH) ret |= (1 << i);

                data[i] = ((buf[i] >>  7) & 0x000001f) | ((buf[i] >>  8) & 0x00003e0)

                        | ((buf[i] >>  9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000)

                        | ((buf[i] >> 11) & 0x1f00000);

        }

        return ret;

}

static void cobra_poll(struct gameport *gameport)

{

        struct cobra *cobra = gameport_get_drvdata(gameport);

        struct input_dev *dev;

        unsigned int data[2];

        int i, j, r;

        cobra->reads++;

        if ((r = cobra_read_packet(gameport, data)) != cobra->exists) {

                cobra->bads++;

                return;

        }

        for (i = 0; i < 2; i++)

                if (cobra->exists & r & (1 << i)) {

                        dev = cobra->dev[i];

                        input_report_abs(dev, ABS_X, ((data[i] >> 4) & 1) - ((data[i] >> 3) & 1));

                        input_report_abs(dev, ABS_Y, ((data[i] >> 2) & 1) - ((data[i] >> 1) & 1));

                        for (j = 0; cobra_btn[j]; j++)

                                input_report_key(dev, cobra_btn[j], data[i] & (0x20 << j));

                        input_sync(dev);

                }

}

static int cobra_open(struct input_dev *dev)

{

        struct cobra *cobra = input_get_drvdata(dev);

        gameport_start_polling(cobra->gameport);

        return 0;

}

static void cobra_close(struct input_dev *dev)

{

        struct cobra *cobra = input_get_drvdata(dev);

        gameport_stop_polling(cobra->gameport);

}

static int cobra_connect(struct gameport *gameport, struct gameport_driver *drv)

{

        struct cobra *cobra;

        struct input_dev *input_dev;

        unsigned int data[2];

        int i, j;

        int err;

        cobra = kzalloc(sizeof(struct cobra), GFP_KERNEL);

        if (!cobra)

                return -ENOMEM;

        cobra->gameport = gameport;

        gameport_set_drvdata(gameport, cobra);

        err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);

        if (err)

                goto fail1;

        cobra->exists = cobra_read_packet(gameport, data);

        for (i = 0; i < 2; i++)

                if ((cobra->exists >> i) & data[i] & 1) {

                        printk(KERN_WARNING "cobra.c: Device %d on %s has the Ext bit set. ID is: %d"

                                " Contact vojtech@ucw.cz\n", i, gameport->phys, (data[i] >> 2) & 7);

                        cobra->exists &= ~(1 << i);

                }

        if (!cobra->exists) {

                err = -ENODEV;

                goto fail2;

        }

        gameport_set_poll_handler(gameport, cobra_poll);

        gameport_set_poll_interval(gameport, 20);

        for (i = 0; i < 2; i++) {

                if (~(cobra->exists >> i) & 1)

                        continue;

                cobra->dev[i] = input_dev = input_allocate_device();

                if (!input_dev) {

                        err = -ENOMEM;

                        goto fail3;

                }

                snprintf(cobra->phys[i], sizeof(cobra->phys[i]),

                         "%s/input%d", gameport->phys, i);

                input_dev->name = "Creative Labs Blaster GamePad Cobra";

                input_dev->phys = cobra->phys[i];

                input_dev->id.bustype = BUS_GAMEPORT;

                input_dev->id.vendor = GAMEPORT_ID_VENDOR_CREATIVE;

                input_dev->id.product = 0x0008;

                input_dev->id.version = 0x0100;

                input_dev->dev.parent = &gameport->dev;

                input_set_drvdata(input_dev, cobra);

                input_dev->open = cobra_open;

                input_dev->close = cobra_close;

                input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);

                input_set_abs_params(input_dev, ABS_X, -1, 1, 0, 0);

                input_set_abs_params(input_dev, ABS_Y, -1, 1, 0, 0);

                for (j = 0; cobra_btn[j]; j++)

                        set_bit(cobra_btn[j], input_dev->keybit);

                err = input_register_device(cobra->dev[i]);

                if (err)

                        goto fail4;

        }

        return 0;

 fail4: input_free_device(cobra->dev[i]);

 fail3: while (--i >= 0)

                if (cobra->dev[i])

                        input_unregister_device(cobra->dev[i]);

 fail2: gameport_close(gameport);

 fail1: gameport_set_drvdata(gameport, NULL);

        kfree(cobra);

        return err;

}

static void cobra_disconnect(struct gameport *gameport)

{

        struct cobra *cobra = gameport_get_drvdata(gameport);

        int i;

        for (i = 0; i < 2; i++)

                if ((cobra->exists >> i) & 1)

                        input_unregister_device(cobra->dev[i]);

        gameport_close(gameport);

        gameport_set_drvdata(gameport, NULL);

        kfree(cobra);

}

static struct gameport_driver cobra_drv = {

        .driver         = {

                .name   = "cobra",

        },

        .description    = DRIVER_DESC,

        .connect        = cobra_connect,

        .disconnect     = cobra_disconnect,

};

static int __init cobra_init(void)

{

        gameport_register_driver(&cobra_drv);

        return 0;

}

static void __exit cobra_exit(void)

{

        gameport_unregister_driver(&cobra_drv);

}

module_init(cobra_init);

module_exit(cobra_exit);