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/*

 * $Id: gf2k.c,v 1.19 2002/01/22 20:27:43 vojtech Exp $

 *

 *  Copyright (c) 1998-2001 Vojtech Pavlik

 */

/*

 * Genius Flight 2000 joystick 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/delay.h>

#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/input.h>

#include <linux/gameport.h>

#include <linux/jiffies.h>

#define DRIVER_DESC     "Genius Flight 2000 joystick driver"

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

MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL");

#define GF2K_START              400     /* The time we wait for the first bit [400 us] */

#define GF2K_STROBE             40      /* The time we wait for the first bit [40 us] */

#define GF2K_TIMEOUT            4       /* Wait for everything to settle [4 ms] */

#define GF2K_LENGTH             80      /* Max number of triplets in a packet */

/*

 * Genius joystick ids ...

 */

#define GF2K_ID_G09             1

#define GF2K_ID_F30D            2

#define GF2K_ID_F30             3

#define GF2K_ID_F31D            4

#define GF2K_ID_F305            5

#define GF2K_ID_F23P            6

#define GF2K_ID_F31             7

#define GF2K_ID_MAX             7

static char gf2k_length[] = { 40, 40, 40, 40, 40, 40, 40, 40 };

static char gf2k_hat_to_axis[][2] = {{ 0, 0}, { 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};

static char *gf2k_names[] = {"", "Genius G-09D", "Genius F-30D", "Genius F-30", "Genius MaxFighter F-31D",

                                "Genius F-30-5", "Genius Flight2000 F-23", "Genius F-31"};

static unsigned char gf2k_hats[] = { 0, 2, 0, 0, 2, 0, 2, 0 };

static unsigned char gf2k_axes[] = { 0, 2, 0, 0, 4, 0, 4, 0 };

static unsigned char gf2k_joys[] = { 0, 0, 0, 0,10, 0, 8, 0 };

static unsigned char gf2k_pads[] = { 0, 6, 0, 0, 0, 0, 0, 0 };

static unsigned char gf2k_lens[] = { 0,18, 0, 0,18, 0,18, 0 };

static unsigned char gf2k_abs[] = { ABS_X, ABS_Y, ABS_THROTTLE, ABS_RUDDER, ABS_GAS, ABS_BRAKE };

static short gf2k_btn_joy[] = { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4 };

static short gf2k_btn_pad[] = { BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_TL2, BTN_TR2, BTN_START, BTN_SELECT };

static short gf2k_seq_reset[] = { 240, 340, 0 };

static short gf2k_seq_digital[] = { 590, 320, 860, 0 };

struct gf2k {

        struct gameport *gameport;

        struct input_dev *dev;

        int reads;

        int bads;

        unsigned char id;

        unsigned char length;

        char phys[32];

};

/*

 * gf2k_read_packet() reads a Genius Flight2000 packet.

 */

static int gf2k_read_packet(struct gameport *gameport, int length, char *data)

{

        unsigned char u, v;

        int i;

        unsigned int t, p;

        unsigned long flags;

        t = gameport_time(gameport, GF2K_START);

        p = gameport_time(gameport, GF2K_STROBE);

        i = 0;

        local_irq_save(flags);

        gameport_trigger(gameport);

        v = gameport_read(gameport);

        while (t > 0 && i < length) {

                t--; u = v;

                v = gameport_read(gameport);

                if (v & ~u & 0x10) {

                        data[i++] = v >> 5;

                        t = p;

                }

        }

        local_irq_restore(flags);

        return i;

}

/*

 * gf2k_trigger_seq() initializes a Genius Flight2000 joystick

 * into digital mode.

 */

static void gf2k_trigger_seq(struct gameport *gameport, short *seq)

{

        unsigned long flags;

        int i, t;

        local_irq_save(flags);

        i = 0;

        do {

                gameport_trigger(gameport);

                t = gameport_time(gameport, GF2K_TIMEOUT * 1000);

                while ((gameport_read(gameport) & 1) && t) t--;

                udelay(seq[i]);

        } while (seq[++i]);

        gameport_trigger(gameport);

        local_irq_restore(flags);

}

/*

 * js_sw_get_bits() composes bits from the triplet buffer into a __u64.

 * Parameter 'pos' is bit number inside packet where to start at, 'num' is number

 * of bits to be read, 'shift' is offset in the resulting __u64 to start at, bits

 * is number of bits per triplet.

 */

#define GB(p,n,s)       gf2k_get_bits(data, p, n, s)

static int gf2k_get_bits(unsigned char *buf, int pos, int num, int shift)

{

        __u64 data = 0;

        int i;

        for (i = 0; i < num / 3 + 2; i++)

                data |= buf[pos / 3 + i] << (i * 3);

        data >>= pos % 3;

        data &= (1 << num) - 1;

        data <<= shift;

        return data;

}

static void gf2k_read(struct gf2k *gf2k, unsigned char *data)

{

        struct input_dev *dev = gf2k->dev;

        int i, t;

        for (i = 0; i < 4 && i < gf2k_axes[gf2k->id]; i++)

                input_report_abs(dev, gf2k_abs[i], GB(i<<3,8,0) | GB(i+46,1,8) | GB(i+50,1,9));

        for (i = 0; i < 2 && i < gf2k_axes[gf2k->id] - 4; i++)

                input_report_abs(dev, gf2k_abs[i], GB(i*9+60,8,0) | GB(i+54,1,9));

        t = GB(40,4,0);

        for (i = 0; i < gf2k_hats[gf2k->id]; i++)

                input_report_abs(dev, ABS_HAT0X + i, gf2k_hat_to_axis[t][i]);

        t = GB(44,2,0) | GB(32,8,2) | GB(78,2,10);

        for (i = 0; i < gf2k_joys[gf2k->id]; i++)

                input_report_key(dev, gf2k_btn_joy[i], (t >> i) & 1);

        for (i = 0; i < gf2k_pads[gf2k->id]; i++)

                input_report_key(dev, gf2k_btn_pad[i], (t >> i) & 1);

        input_sync(dev);

}

/*

 * gf2k_poll() reads and analyzes Genius joystick data.

 */

static void gf2k_poll(struct gameport *gameport)

{

        struct gf2k *gf2k = gameport_get_drvdata(gameport);

        unsigned char data[GF2K_LENGTH];

        gf2k->reads++;

        if (gf2k_read_packet(gf2k->gameport, gf2k_length[gf2k->id], data) < gf2k_length[gf2k->id])

                gf2k->bads++;

        else

                gf2k_read(gf2k, data);

}

static int gf2k_open(struct input_dev *dev)

{

        struct gf2k *gf2k = input_get_drvdata(dev);

        gameport_start_polling(gf2k->gameport);

        return 0;

}

static void gf2k_close(struct input_dev *dev)

{

        struct gf2k *gf2k = input_get_drvdata(dev);

        gameport_stop_polling(gf2k->gameport);

}

/*

 * gf2k_connect() probes for Genius id joysticks.

 */

static int gf2k_connect(struct gameport *gameport, struct gameport_driver *drv)

{

        struct gf2k *gf2k;

        struct input_dev *input_dev;

        unsigned char data[GF2K_LENGTH];

        int i, err;

        gf2k = kzalloc(sizeof(struct gf2k), GFP_KERNEL);

        input_dev = input_allocate_device();

        if (!gf2k || !input_dev) {

                err = -ENOMEM;

                goto fail1;

        }

        gf2k->gameport = gameport;

        gf2k->dev = input_dev;

        gameport_set_drvdata(gameport, gf2k);

        err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);

        if (err)

                goto fail1;

        gf2k_trigger_seq(gameport, gf2k_seq_reset);

        msleep(GF2K_TIMEOUT);

        gf2k_trigger_seq(gameport, gf2k_seq_digital);

        msleep(GF2K_TIMEOUT);

        if (gf2k_read_packet(gameport, GF2K_LENGTH, data) < 12) {

                err = -ENODEV;

                goto fail2;

        }

        if (!(gf2k->id = GB(7,2,0) | GB(3,3,2) | GB(0,3,5))) {

                err = -ENODEV;

                goto fail2;

        }

#ifdef RESET_WORKS

        if ((gf2k->id != (GB(19,2,0) | GB(15,3,2) | GB(12,3,5))) ||

            (gf2k->id != (GB(31,2,0) | GB(27,3,2) | GB(24,3,5)))) {

                err = -ENODEV;

                goto fail2;

        }

#else

        gf2k->id = 6;

#endif

        if (gf2k->id > GF2K_ID_MAX || !gf2k_axes[gf2k->id]) {

                printk(KERN_WARNING "gf2k.c: Not yet supported joystick on %s. [id: %d type:%s]\n",

                        gameport->phys, gf2k->id, gf2k->id > GF2K_ID_MAX ? "Unknown" : gf2k_names[gf2k->id]);

                err = -ENODEV;

                goto fail2;

        }

        gameport_set_poll_handler(gameport, gf2k_poll);

        gameport_set_poll_interval(gameport, 20);

        snprintf(gf2k->phys, sizeof(gf2k->phys), "%s/input0", gameport->phys);

        gf2k->length = gf2k_lens[gf2k->id];

        input_dev->name = gf2k_names[gf2k->id];

        input_dev->phys = gf2k->phys;

        input_dev->id.bustype = BUS_GAMEPORT;

        input_dev->id.vendor = GAMEPORT_ID_VENDOR_GENIUS;

        input_dev->id.product = gf2k->id;

        input_dev->id.version = 0x0100;

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

        input_set_drvdata(input_dev, gf2k);

        input_dev->open = gf2k_open;

        input_dev->close = gf2k_close;

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

        for (i = 0; i < gf2k_axes[gf2k->id]; i++)

                set_bit(gf2k_abs[i], input_dev->absbit);

        for (i = 0; i < gf2k_hats[gf2k->id]; i++) {

                set_bit(ABS_HAT0X + i, input_dev->absbit);

                input_dev->absmin[ABS_HAT0X + i] = -1;

                input_dev->absmax[ABS_HAT0X + i] = 1;

        }

        for (i = 0; i < gf2k_joys[gf2k->id]; i++)

                set_bit(gf2k_btn_joy[i], input_dev->keybit);

        for (i = 0; i < gf2k_pads[gf2k->id]; i++)

                set_bit(gf2k_btn_pad[i], input_dev->keybit);

        gf2k_read_packet(gameport, gf2k->length, data);

        gf2k_read(gf2k, data);

        for (i = 0; i < gf2k_axes[gf2k->id]; i++) {

                input_dev->absmax[gf2k_abs[i]] = (i < 2) ? input_dev->abs[gf2k_abs[i]] * 2 - 32 :

                          input_dev->abs[gf2k_abs[0]] + input_dev->abs[gf2k_abs[1]] - 32;

                input_dev->absmin[gf2k_abs[i]] = 32;

                input_dev->absfuzz[gf2k_abs[i]] = 8;

                input_dev->absflat[gf2k_abs[i]] = (i < 2) ? 24 : 0;

        }

        err = input_register_device(gf2k->dev);

        if (err)

                goto fail2;

        return 0;

 fail2: gameport_close(gameport);

 fail1: gameport_set_drvdata(gameport, NULL);

        input_free_device(input_dev);

        kfree(gf2k);

        return err;

}

static void gf2k_disconnect(struct gameport *gameport)

{

        struct gf2k *gf2k = gameport_get_drvdata(gameport);

        input_unregister_device(gf2k->dev);

        gameport_close(gameport);

        gameport_set_drvdata(gameport, NULL);

        kfree(gf2k);

}

static struct gameport_driver gf2k_drv = {

        .driver         = {

                .name   = "gf2k",

        },

        .description    = DRIVER_DESC,

        .connect        = gf2k_connect,

        .disconnect     = gf2k_disconnect,

};

static int __init gf2k_init(void)

{

        gameport_register_driver(&gf2k_drv);

        return 0;

}

static void __exit gf2k_exit(void)

{

        gameport_unregister_driver(&gf2k_drv);

}

module_init(gf2k_init);

module_exit(gf2k_exit);