ADI.c

From: vladster (vladster_at_localhost.localdomain)
Date: 07/27/04 

Date: Tue, 27 Jul 2004 01:33:20 GMT

I have a problem, I recieved a rudely terse response from the developer of
the joystick driver and have resigned myself to other resources. I am very
new at coding and would like a little help if someone could be so kind .
The problem is the hat to axis conversion in the original adi.c code. I
tried to change it but the process breaks. Could some shed some light on
how to get the hats to work like switches so I can use them on my Wingman
interceptor?

/*
 * $Id: adi.c,v 1.15 2001/01/09 13:32:39 vojtech Exp $
 *
 * Copyright (c) 1998-2000 Vojtech Pavlik
 *
 * Sponsored by SuSE
 */

/*
 * 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@suse.cz>, or by paper mail:
 * Vojtech Pavlik, Ucitelska 1576, 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>

/*
 * 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_REFRESH_TIME HZ/50 /* How often to poll the joystick [20 ms] */
#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 48
#define ADI_MAX_CNAME_LENGTH 16

#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];
        unsigned char data[ADI_MAX_LENGTH];
};

struct adi_port {
        struct gameport *gameport;
        struct timer_list timer;
        struct adi adi[2];
        int bad;
        int reads;
        int used;
};

/*
 * 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;
        }

        __save_flags(flags);
        __cli();

        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);

        __restore_flags(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));

        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_timer() repeatedly polls the Logitech joysticks.
 */

static void adi_timer(unsigned long data)
{
        struct adi_port *port = (void *) data;
        port->bad -= adi_read(port);
        port->reads++;
        mod_timer(&port->timer, jiffies + ADI_REFRESH_TIME);
}

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

static int adi_open(struct input_dev *dev)
{
        struct adi_port *port = dev->private;
        if (!port->used++)
                mod_timer(&port->timer, jiffies + ADI_REFRESH_TIME);
        return 0;
}

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

static void adi_close(struct input_dev *dev)
{
        struct adi_port *port = dev->private;
        if (!--port->used)
                del_timer(&port->timer);
}

/*
 * 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[] = { 3, -2, -3, 10, -6, -11, -7, -9, 11, 0 };
        int i;

        for (i = 0; seq[i]; i++) {
                gameport_trigger(gameport);
                if (seq[i] > 0) wait_ms(seq[i]);
                if (seq[i] < 0) mdelay(-seq[i]);
        }
}

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 void adi_init_input(struct adi *adi, struct adi_port *port)
{
        int i, t;
        char buf[ADI_MAX_NAME_LENGTH];

        if (!adi->length) return;

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

        sprintf(buf, adi_names[t], adi->id);
        sprintf(adi->name, "Logitech %s", buf);

        adi->abs = adi_abs[t];
        adi->key = adi_key[t];

        adi->dev.open = adi_open;
        adi->dev.close = adi_close;

        adi->dev.name = adi->name;
        adi->dev.idbus = BUS_GAMEPORT;
        adi->dev.idvendor = GAMEPORT_ID_VENDOR_LOGITECH;
        adi->dev.idproduct = adi->id;
        adi->dev.idversion = 0x0100;

        adi->dev.private = port;
        adi->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);

        for (i = 0; i < adi->axes10 + adi->axes8 + (adi->hats + (adi->pad > 0)) * 2; i++)
                set_bit(adi->abs[i], &adi->dev.absbit);

        for (i = 0; i < adi->buttons; i++)
                set_bit(adi->key[i], &adi->dev.keybit);
}

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 > 0)) * 2; i++) {

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

                if (t == ABS_THROTTLE || t == ABS_RUDDER || adi->id == ADI_ID_WGPE) {
                        if (i < adi->axes10) x = 512; else x = 128;
                }

                if (i < adi->axes10) {
                        adi->dev.absmax[t] = x * 2 - 64;
                        adi->dev.absmin[t] = 64;
                        adi->dev.absfuzz[t] = 2;
                        adi->dev.absflat[t] = 16;
                        continue;
                }

                if (i < adi->axes10 + adi->axes8) {
                        adi->dev.absmax[t] = x * 2 - 48;
                        adi->dev.absmin[t] = 48;
                        adi->dev.absfuzz[t] = 1;
                        adi->dev.absflat[t] = 16;
                        continue;
                }

                adi->dev.absmax[t] = 1;
                adi->dev.absmin[t] = -1;
        }
}

/*
 * adi_connect() probes for Logitech ADI joysticks.
 */

static void adi_connect(struct gameport *gameport, struct gameport_dev *dev)
{
        struct adi_port *port;
        int i;

        if (!(port = kmalloc(sizeof(struct adi_port), GFP_KERNEL)))
                return;
        memset(port, 0, sizeof(struct adi_port));

        gameport->private = port;

        port->gameport = gameport;
        init_timer(&port->timer);
        port->timer.data = (long) port;
        port->timer.function = adi_timer;

        if (gameport_open(gameport, dev, GAMEPORT_MODE_RAW)) {
                kfree(port);
                return;
        }

        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);
                adi_init_input(port->adi + i, port);
        }

        if (!port->adi[0].length && !port->adi[1].length) {
                gameport_close(gameport);
                kfree(port);
                return;
        }

        wait_ms(ADI_INIT_DELAY);
        if (adi_read(port)) {
                wait_ms(ADI_DATA_DELAY);
                adi_read(port);
        }

        for (i = 0; i < 2; i++)
                if (port->adi[i].length > 0) {
                        adi_init_center(port->adi + i);
                        input_register_device(&port->adi[i].dev);
                        printk(KERN_INFO "input%d: %s [%s] on gameport%d.%d\n",
                                port->adi[i].dev.number, port->adi[i].name, port->adi[i].cname, gameport->number, i);
                }
}

static void adi_disconnect(struct gameport *gameport)
{
        int i;

        struct adi_port *port = gameport->private;
        for (i = 0; i < 2; i++)
                if (port->adi[i].length > 0)
                        input_unregister_device(&port->adi[i].dev);
        gameport_close(gameport);
        kfree(port);
}

/*
 * The gameport device structure.
 */

static struct gameport_dev adi_dev = {
        connect: adi_connect,
        disconnect: adi_disconnect,
};

int __init adi_init(void)
{
        gameport_register_device(&adi_dev);
        return 0;
}

void __exit adi_exit(void)
{
        gameport_unregister_device(&adi_dev);
}

module_init(adi_init);
module_exit(adi_exit);

MODULE_LICENSE("GPL");

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