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/*

 *  Copyright (c) 1998-2005 Vojtech Pavlik

 */

/*

 * Logitech ADI joystick family 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/module.h>

#include <linux/string.h>

#include <linux/slab.h>

#include <linux/input.h>

#include <linux/gameport.h>

#include <linux/init.h>

#include <linux/jiffies.h>

#define DRIVER_DESC     "Logitech ADI joystick family driver"

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

MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL");

/*

 * Times, array sizes, flags, ids.

 */

#define ADI_MAX_START           200     /* Trigger to packet timeout [200us] */

#define ADI_MAX_STROBE          40      /* Single bit timeout [40us] */

#define ADI_INIT_DELAY          10      /* Delay after init packet [10ms] */

#define ADI_DATA_DELAY          4       /* Delay after data packet [4ms] */

#define ADI_MAX_LENGTH          256

#define ADI_MIN_LENGTH          8

#define ADI_MIN_LEN_LENGTH      10

#define ADI_MIN_ID_LENGTH       66

#define ADI_MAX_NAME_LENGTH     64

#define ADI_MAX_CNAME_LENGTH    16

#define ADI_MAX_PHYS_LENGTH     64

#define ADI_FLAG_HAT            0x04

#define ADI_FLAG_10BIT          0x08

#define ADI_ID_TPD              0x01

#define ADI_ID_WGP              0x06

#define ADI_ID_WGPE             0x08

#define ADI_ID_MAX              0x0a

/*

 * Names, buttons, axes ...

 */

static char *adi_names[] = {    "WingMan Extreme Digital", "ThunderPad Digital", "SideCar", "CyberMan 2",

                                "WingMan Interceptor", "WingMan Formula", "WingMan GamePad",

                                "WingMan Extreme Digital 3D", "WingMan GamePad Extreme",

                                "WingMan GamePad USB", "Unknown Device %#x" };

static char adi_wmgpe_abs[] =   { ABS_X, ABS_Y, ABS_HAT0X, ABS_HAT0Y };

static char adi_wmi_abs[] =     { ABS_X, ABS_Y, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y, ABS_HAT2X, ABS_HAT2Y };

static char adi_wmed3d_abs[] =  { ABS_X, ABS_Y, ABS_THROTTLE, ABS_RZ, ABS_HAT0X, ABS_HAT0Y };

static char adi_cm2_abs[] =     { ABS_X, ABS_Y, ABS_Z, ABS_RX, ABS_RY, ABS_RZ };

static char adi_wmf_abs[] =     { ABS_WHEEL, ABS_GAS, ABS_BRAKE, ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y, ABS_HAT2X, ABS_HAT2Y };

static short adi_wmgpe_key[] =  { BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z,  BTN_TL, BTN_TR, BTN_START, BTN_MODE, BTN_SELECT };

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

static short adi_wmed3d_key[] = { BTN_TRIGGER, BTN_THUMB, BTN_THUMB2, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2 };

static short adi_cm2_key[] =    { BTN_1, BTN_2, BTN_3, BTN_4, BTN_5, BTN_6, BTN_7, BTN_8 };

static char* adi_abs[] = { adi_wmi_abs, adi_wmgpe_abs, adi_wmf_abs, adi_cm2_abs, adi_wmi_abs, adi_wmf_abs,

                           adi_wmgpe_abs, adi_wmed3d_abs, adi_wmgpe_abs, adi_wmgpe_abs, adi_wmi_abs };

static short* adi_key[] = { adi_wmi_key, adi_wmgpe_key, adi_cm2_key, adi_cm2_key, adi_wmi_key, adi_cm2_key,

                            adi_wmgpe_key, adi_wmed3d_key, adi_wmgpe_key, adi_wmgpe_key, adi_wmi_key };

/*

 * Hat to axis conversion arrays.

 */

static struct {

        int x;

        int y;

} adi_hat_to_axis[] = {{ 0, 0}, { 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};

/*

 * Per-port information.

 */

struct adi {

        struct input_dev *dev;

        int length;

        int ret;

        int idx;

        unsigned char id;

        char buttons;

        char axes10;

        char axes8;

        signed char pad;

        char hats;

        char *abs;

        short *key;

        char name[ADI_MAX_NAME_LENGTH];

        char cname[ADI_MAX_CNAME_LENGTH];

        char phys[ADI_MAX_PHYS_LENGTH];

        unsigned char data[ADI_MAX_LENGTH];

};

struct adi_port {

        struct gameport *gameport;

        struct adi adi[2];

        int bad;

        int reads;

};

/*

 * adi_read_packet() reads a Logitech ADI packet.

 */

static void adi_read_packet(struct adi_port *port)

{

        struct adi *adi = port->adi;

        struct gameport *gameport = port->gameport;

        unsigned char u, v, w, x, z;

        int t[2], s[2], i;

        unsigned long flags;

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

                adi[i].ret = -1;

                t[i] = gameport_time(gameport, ADI_MAX_START);

                s[i] = 0;

        }

        local_irq_save(flags);

        gameport_trigger(gameport);

        v = z = gameport_read(gameport);

        do {

                u = v;

                w = u ^ (v = x = gameport_read(gameport));

                for (i = 0; i < 2; i++, w >>= 2, x >>= 2) {

                        t[i]--;

                        if ((w & 0x30) && s[i]) {

                                if ((w & 0x30) < 0x30 && adi[i].ret < ADI_MAX_LENGTH && t[i] > 0) {

                                        adi[i].data[++adi[i].ret] = w;

                                        t[i] = gameport_time(gameport, ADI_MAX_STROBE);

                                } else t[i] = 0;

                        } else if (!(x & 0x30)) s[i] = 1;

                }

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

        local_irq_restore(flags);

        return;

}

/*

 * adi_move_bits() detects a possible 2-stream mode, and moves

 * the bits accordingly.

 */

static void adi_move_bits(struct adi_port *port, int length)

{

        int i;

        struct adi *adi = port->adi;

        adi[0].idx = adi[1].idx = 0;

        if (adi[0].ret <= 0 || adi[1].ret <= 0) return;

        if (adi[0].data[0] & 0x20 || ~adi[1].data[0] & 0x20) return;

        for (i = 1; i <= adi[1].ret; i++)

                adi[0].data[((length - 1) >> 1) + i + 1] = adi[1].data[i];

        adi[0].ret += adi[1].ret;

        adi[1].ret = -1;

}

/*

 * adi_get_bits() gathers bits from the data packet.

 */

static inline int adi_get_bits(struct adi *adi, int count)

{

        int bits = 0;

        int i;

        if ((adi->idx += count) > adi->ret) return 0;

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

                bits |= ((adi->data[adi->idx - i] >> 5) & 1) << i;

        return bits;

}

/*

 * adi_decode() decodes Logitech joystick data into input events.

 */

static int adi_decode(struct adi *adi)

{

        struct input_dev *dev = adi->dev;

        char *abs = adi->abs;

        short *key = adi->key;

        int i, t;

        if (adi->ret < adi->length || adi->id != (adi_get_bits(adi, 4) | (adi_get_bits(adi, 4) << 4)))

                return -1;

        for (i = 0; i < adi->axes10; i++)

                input_report_abs(dev, *abs++, adi_get_bits(adi, 10));

        for (i = 0; i < adi->axes8; i++)

                input_report_abs(dev, *abs++, adi_get_bits(adi, 8));

        for (i = 0; i < adi->buttons && i < 63; i++) {

                if (i == adi->pad) {

                        t = adi_get_bits(adi, 4);

                        input_report_abs(dev, *abs++, ((t >> 2) & 1) - ( t       & 1));

                        input_report_abs(dev, *abs++, ((t >> 1) & 1) - ((t >> 3) & 1));

                }

                input_report_key(dev, *key++, adi_get_bits(adi, 1));

        }

        for (i = 0; i < adi->hats; i++) {

                if ((t = adi_get_bits(adi, 4)) > 8) t = 0;

                input_report_abs(dev, *abs++, adi_hat_to_axis[t].x);

                input_report_abs(dev, *abs++, adi_hat_to_axis[t].y);

        }

        for (i = 63; i < adi->buttons; i++)

                input_report_key(dev, *key++, adi_get_bits(adi, 1));

        input_sync(dev);

        return 0;

}

/*

 * adi_read() reads the data packet and decodes it.

 */

static int adi_read(struct adi_port *port)

{

        int i;

        int result = 0;

        adi_read_packet(port);

        adi_move_bits(port, port->adi[0].length);

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

                if (port->adi[i].length)

                         result |= adi_decode(port->adi + i);

        return result;

}

/*

 * adi_poll() repeatedly polls the Logitech joysticks.

 */

static void adi_poll(struct gameport *gameport)

{

        struct adi_port *port = gameport_get_drvdata(gameport);

        port->bad -= adi_read(port);

        port->reads++;

}

/*

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

 */

static int adi_open(struct input_dev *dev)

{

        struct adi_port *port = input_get_drvdata(dev);

        gameport_start_polling(port->gameport);

        return 0;

}

/*

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

 */

static void adi_close(struct input_dev *dev)

{

        struct adi_port *port = input_get_drvdata(dev);

        gameport_stop_polling(port->gameport);

}

/*

 * adi_init_digital() sends a trigger & delay sequence

 * to reset and initialize a Logitech joystick into digital mode.

 */

static void adi_init_digital(struct gameport *gameport)

{

        int seq[] = { 4, -2, -3, 10, -6, -11, -7, -9, 11, 0 };

        int i;

        for (i = 0; seq[i]; i++) {

                gameport_trigger(gameport);

                if (seq[i] > 0)

                        msleep(seq[i]);

                if (seq[i] < 0) {

                        mdelay(-seq[i]);

                        udelay(-seq[i]*14);     /* It looks like mdelay() is off by approx 1.4% */

                }

        }

}

static void adi_id_decode(struct adi *adi, struct adi_port *port)

{

        int i, t;

        if (adi->ret < ADI_MIN_ID_LENGTH) /* Minimum ID packet length */

                return;

        if (adi->ret < (t = adi_get_bits(adi, 10))) {

                printk(KERN_WARNING "adi: Short ID packet: reported: %d != read: %d\n", t, adi->ret);

                return;

        }

        adi->id = adi_get_bits(adi, 4) | (adi_get_bits(adi, 4) << 4);

        if ((t = adi_get_bits(adi, 4)) & ADI_FLAG_HAT) adi->hats++;

        adi->length = adi_get_bits(adi, 10);

        if (adi->length >= ADI_MAX_LENGTH || adi->length < ADI_MIN_LENGTH) {

                printk(KERN_WARNING "adi: Bad data packet length (%d).\n", adi->length);

                adi->length = 0;

                return;

        }

        adi->axes8 = adi_get_bits(adi, 4);

        adi->buttons = adi_get_bits(adi, 6);

        if (adi_get_bits(adi, 6) != 8 && adi->hats) {

                printk(KERN_WARNING "adi: Other than 8-dir POVs not supported yet.\n");

                adi->length = 0;

                return;

        }

        adi->buttons += adi_get_bits(adi, 6);

        adi->hats += adi_get_bits(adi, 4);

        i = adi_get_bits(adi, 4);

        if (t & ADI_FLAG_10BIT) {

                adi->axes10 = adi->axes8 - i;

                adi->axes8 = i;

        }

        t = adi_get_bits(adi, 4);

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

                adi->cname[i] = adi_get_bits(adi, 8);

        adi->cname[i] = 0;

        t = 8 + adi->buttons + adi->axes10 * 10 + adi->axes8 * 8 + adi->hats * 4;

        if (adi->length != t && adi->length != t + (t & 1)) {

                printk(KERN_WARNING "adi: Expected length %d != data length %d\n", t, adi->length);

                adi->length = 0;

                return;

        }

        switch (adi->id) {

                case ADI_ID_TPD:

                        adi->pad = 4;

                        adi->buttons -= 4;

                        break;

                case ADI_ID_WGP:

                        adi->pad = 0;

                        adi->buttons -= 4;

                        break;

                default:

                        adi->pad = -1;

                        break;

        }

}

static int adi_init_input(struct adi *adi, struct adi_port *port, int half)

{

        struct input_dev *input_dev;

        char buf[ADI_MAX_NAME_LENGTH];

        int i, t;

        adi->dev = input_dev = input_allocate_device();

        if (!input_dev)

                return -ENOMEM;

        t = adi->id < ADI_ID_MAX ? adi->id : ADI_ID_MAX;

        snprintf(buf, ADI_MAX_PHYS_LENGTH, adi_names[t], adi->id);

        snprintf(adi->name, ADI_MAX_NAME_LENGTH, "Logitech %s [%s]", buf, adi->cname);

        snprintf(adi->phys, ADI_MAX_PHYS_LENGTH, "%s/input%d", port->gameport->phys, half);

        adi->abs = adi_abs[t];

        adi->key = adi_key[t];

        input_dev->name = adi->name;

        input_dev->phys = adi->phys;

        input_dev->id.bustype = BUS_GAMEPORT;

        input_dev->id.vendor = GAMEPORT_ID_VENDOR_LOGITECH;

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

        input_dev->id.version = 0x0100;

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

        input_set_drvdata(input_dev, port);

        input_dev->open = adi_open;

        input_dev->close = adi_close;

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

        for (i = 0; i < adi->axes10 + adi->axes8 + (adi->hats + (adi->pad != -1)) * 2; i++)

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

        for (i = 0; i < adi->buttons; i++)

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

        return 0;

}

static void adi_init_center(struct adi *adi)

{

        int i, t, x;

        if (!adi->length)

                return;

        for (i = 0; i < adi->axes10 + adi->axes8 + (adi->hats + (adi->pad != -1)) * 2; i++) {

                t = adi->abs[i];

                x = adi->dev->abs[t];

                if (t == ABS_THROTTLE || t == ABS_RUDDER || adi->id == ADI_ID_WGPE)

                        x = i < adi->axes10 ? 512 : 128;

                if (i < adi->axes10)

                        input_set_abs_params(adi->dev, t, 64, x * 2 - 64, 2, 16);

                else if (i < adi->axes10 + adi->axes8)

                        input_set_abs_params(adi->dev, t, 48, x * 2 - 48, 1, 16);

                else

                        input_set_abs_params(adi->dev, t, -1, 1, 0, 0);

        }

}

/*

 * adi_connect() probes for Logitech ADI joysticks.

 */

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

{

        struct adi_port *port;

        int i;

        int err;

        port = kzalloc(sizeof(struct adi_port), GFP_KERNEL);

        if (!port)

                return -ENOMEM;

        port->gameport = gameport;

        gameport_set_drvdata(gameport, port);

        err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);

        if (err)

                goto fail1;

        adi_init_digital(gameport);

        adi_read_packet(port);

        if (port->adi[0].ret >= ADI_MIN_LEN_LENGTH)

                adi_move_bits(port, adi_get_bits(port->adi, 10));

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

                adi_id_decode(port->adi + i, port);

                if (!port->adi[i].length)

                        continue;

                err = adi_init_input(port->adi + i, port, i);

                if (err)

                        goto fail2;

        }

        if (!port->adi[0].length && !port->adi[1].length) {

                err = -ENODEV;

                goto fail2;

        }

        gameport_set_poll_handler(gameport, adi_poll);

        gameport_set_poll_interval(gameport, 20);

        msleep(ADI_INIT_DELAY);

        if (adi_read(port)) {

                msleep(ADI_DATA_DELAY);

                adi_read(port);

        }

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

                if (port->adi[i].length > 0) {

                        adi_init_center(port->adi + i);

                        err = input_register_device(port->adi[i].dev);

                        if (err)

                                goto fail3;

                }

        return 0;

 fail3: while (--i >= 0) {

                if (port->adi[i].length > 0) {

                        input_unregister_device(port->adi[i].dev);

                        port->adi[i].dev = NULL;

                }

        }

 fail2: for (i = 0; i < 2; i++)

                if (port->adi[i].dev)

                        input_free_device(port->adi[i].dev);

        gameport_close(gameport);

 fail1: gameport_set_drvdata(gameport, NULL);

        kfree(port);

        return err;

}

static void adi_disconnect(struct gameport *gameport)

{

        int i;

        struct adi_port *port = gameport_get_drvdata(gameport);

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

                if (port->adi[i].length > 0)

                        input_unregister_device(port->adi[i].dev);

        gameport_close(gameport);

        gameport_set_drvdata(gameport, NULL);

        kfree(port);

}

/*

 * The gameport device structure.

 */

static struct gameport_driver adi_drv = {

        .driver         = {

                .name   = "adi",

        },

        .description    = DRIVER_DESC,

        .connect        = adi_connect,

        .disconnect     = adi_disconnect,

};

static int __init adi_init(void)

{

        gameport_register_driver(&adi_drv);

        return 0;

}

static void __exit adi_exit(void)

{

        gameport_unregister_driver(&adi_drv);

}

module_init(adi_init);

module_exit(adi_exit);