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/*

 * $Id: guillemot.c,v 1.10 2002/01/22 20:28:12 vojtech Exp $

 *

 *  Copyright (c) 2001 Vojtech Pavlik

 */

/*

 * Guillemot Digital Interface Protocol 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/slab.h>

#include <linux/module.h>

#include <linux/delay.h>

#include <linux/init.h>

#include <linux/gameport.h>

#include <linux/input.h>

#include <linux/jiffies.h>

#define DRIVER_DESC     "Guillemot Digital joystick driver"

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

MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL");

#define GUILLEMOT_MAX_START     600     /* 600 us */

#define GUILLEMOT_MAX_STROBE    60      /* 60 us */

#define GUILLEMOT_MAX_LENGTH    17      /* 17 bytes */

static short guillemot_abs_pad[] =

        { ABS_X, ABS_Y, ABS_THROTTLE, ABS_RUDDER, -1 };

static short guillemot_btn_pad[] =

        { BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_MODE, BTN_SELECT, -1 };

static struct {

        int x;

        int y;

} guillemot_hat_to_axis[16] = {{ 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};

struct guillemot_type {

        unsigned char id;

        short *abs;

        short *btn;

        int hat;

        char *name;

};

struct guillemot {

        struct gameport *gameport;

        struct input_dev *dev;

        int bads;

        int reads;

        struct guillemot_type *type;

        unsigned char length;

        char phys[32];

};

static struct guillemot_type guillemot_type[] = {

        { 0x00, guillemot_abs_pad, guillemot_btn_pad, 1, "Guillemot Pad" },

        { 0 }};

/*

 * guillemot_read_packet() reads Guillemot joystick data.

 */

static int guillemot_read_packet(struct gameport *gameport, u8 *data)

{

        unsigned long flags;

        unsigned char u, v;

        unsigned int t, s;

        int i;

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

                data[i] = 0;

        i = 0;

        t = gameport_time(gameport, GUILLEMOT_MAX_START);

        s = gameport_time(gameport, GUILLEMOT_MAX_STROBE);

        local_irq_save(flags);

        gameport_trigger(gameport);

        v = gameport_read(gameport);

        while (t > 0 && i < GUILLEMOT_MAX_LENGTH * 8) {

                t--;

                u = v; v = gameport_read(gameport);

                if (v & ~u & 0x10) {

                        data[i >> 3] |= ((v >> 5) & 1) << (i & 7);

                        i++;

                        t = s;

                }

        }

        local_irq_restore(flags);

        return i;

}

/*

 * guillemot_poll() reads and analyzes Guillemot joystick data.

 */

static void guillemot_poll(struct gameport *gameport)

{

        struct guillemot *guillemot = gameport_get_drvdata(gameport);

        struct input_dev *dev = guillemot->dev;

        u8 data[GUILLEMOT_MAX_LENGTH];

        int i;

        guillemot->reads++;

        if (guillemot_read_packet(guillemot->gameport, data) != GUILLEMOT_MAX_LENGTH * 8 ||

                data[0] != 0x55 || data[16] != 0xaa) {

                guillemot->bads++;

        } else {

                for (i = 0; i < 6 && guillemot->type->abs[i] >= 0; i++)

                        input_report_abs(dev, guillemot->type->abs[i], data[i + 5]);

                if (guillemot->type->hat) {

                        input_report_abs(dev, ABS_HAT0X, guillemot_hat_to_axis[data[4] >> 4].x);

                        input_report_abs(dev, ABS_HAT0Y, guillemot_hat_to_axis[data[4] >> 4].y);

                }

                for (i = 0; i < 16 && guillemot->type->btn[i] >= 0; i++)

                        input_report_key(dev, guillemot->type->btn[i], (data[2 + (i >> 3)] >> (i & 7)) & 1);

        }

        input_sync(dev);

}

/*

 * guillemot_open() is a callback from the input open routine.

 */

static int guillemot_open(struct input_dev *dev)

{

        struct guillemot *guillemot = input_get_drvdata(dev);

        gameport_start_polling(guillemot->gameport);

        return 0;

}

/*

 * guillemot_close() is a callback from the input close routine.

 */

static void guillemot_close(struct input_dev *dev)

{

        struct guillemot *guillemot = input_get_drvdata(dev);

        gameport_stop_polling(guillemot->gameport);

}

/*

 * guillemot_connect() probes for Guillemot joysticks.

 */

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

{

        struct guillemot *guillemot;

        struct input_dev *input_dev;

        u8 data[GUILLEMOT_MAX_LENGTH];

        int i, t;

        int err;

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

        input_dev = input_allocate_device();

        if (!guillemot || !input_dev) {

                err = -ENOMEM;

                goto fail1;

        }

        guillemot->gameport = gameport;

        guillemot->dev = input_dev;

        gameport_set_drvdata(gameport, guillemot);

        err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);

        if (err)

                goto fail1;

        i = guillemot_read_packet(gameport, data);

        if (i != GUILLEMOT_MAX_LENGTH * 8 || data[0] != 0x55 || data[16] != 0xaa) {

                err = -ENODEV;

                goto fail2;

        }

        for (i = 0; guillemot_type[i].name; i++)

                if (guillemot_type[i].id == data[11])

                        break;

        if (!guillemot_type[i].name) {

                printk(KERN_WARNING "guillemot.c: Unknown joystick on %s. [ %02x%02x:%04x, ver %d.%02d ]\n",

                        gameport->phys, data[12], data[13], data[11], data[14], data[15]);

                err = -ENODEV;

                goto fail2;

        }

        gameport_set_poll_handler(gameport, guillemot_poll);

        gameport_set_poll_interval(gameport, 20);

        snprintf(guillemot->phys, sizeof(guillemot->phys), "%s/input0", gameport->phys);

        guillemot->type = guillemot_type + i;

        input_dev->name = guillemot_type[i].name;

        input_dev->phys = guillemot->phys;

        input_dev->id.bustype = BUS_GAMEPORT;

        input_dev->id.vendor = GAMEPORT_ID_VENDOR_GUILLEMOT;

        input_dev->id.product = guillemot_type[i].id;

        input_dev->id.version = (int)data[14] << 8 | data[15];

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

        input_set_drvdata(input_dev, guillemot);

        input_dev->open = guillemot_open;

        input_dev->close = guillemot_close;

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

        for (i = 0; (t = guillemot->type->abs[i]) >= 0; i++)

                input_set_abs_params(input_dev, t, 0, 255, 0, 0);

        if (guillemot->type->hat) {

                input_set_abs_params(input_dev, ABS_HAT0X, -1, 1, 0, 0);

                input_set_abs_params(input_dev, ABS_HAT0Y, -1, 1, 0, 0);

        }

        for (i = 0; (t = guillemot->type->btn[i]) >= 0; i++)

                set_bit(t, input_dev->keybit);

        err = input_register_device(guillemot->dev);

        if (err)

                goto fail2;

        return 0;

fail2:  gameport_close(gameport);

fail1:  gameport_set_drvdata(gameport, NULL);

        input_free_device(input_dev);

        kfree(guillemot);

        return err;

}

static void guillemot_disconnect(struct gameport *gameport)

{

        struct guillemot *guillemot = gameport_get_drvdata(gameport);

        printk(KERN_INFO "guillemot.c: Failed %d reads out of %d on %s\n", guillemot->reads, guillemot->bads, guillemot->phys);

        input_unregister_device(guillemot->dev);

        gameport_close(gameport);

        kfree(guillemot);

}

static struct gameport_driver guillemot_drv = {

        .driver         = {

                .name   = "guillemot",

        },

        .description    = DRIVER_DESC,

        .connect        = guillemot_connect,

        .disconnect     = guillemot_disconnect,

};

static int __init guillemot_init(void)

{

        gameport_register_driver(&guillemot_drv);

        return 0;

}

static void __exit guillemot_exit(void)

{

        gameport_unregister_driver(&guillemot_drv);

}

module_init(guillemot_init);

module_exit(guillemot_exit);