iforce-packets.c

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/*
 *  Copyright (c) 2000-2002 Vojtech Pavlik <[email protected]>
 *  Copyright (c) 2001-2002, 2007 Johann Deneux <[email protected]>
 *
 *  USB/RS232 I-Force joysticks and wheels.
 */

/*
 * 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 <[email protected]>, or by paper mail:
 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 */

#include "iforce.h"

static struct {
    __s32 x;
    __s32 y;
} iforce_hat_to_axis[16] = {{ 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};


void iforce_dump_packet(char *msg, u16 cmd, unsigned char *data)
{
    int i;

    printk(KERN_DEBUG __FILE__ ": %s cmd = %04x, data = ", msg, cmd);
    for (i = 0; i < LO(cmd); i++)
        printk("%02x ", data[i]);
    printk("\n");
}

/*
 * Send a packet of bytes to the device
 */
int iforce_send_packet(struct iforce *iforce, u16 cmd, unsigned char* data)
{
    /* Copy data to buffer */
    int n = LO(cmd);
    int c;
    int empty;
    int head, tail;
    unsigned long flags;

/*
 * Update head and tail of xmit buffer
 */
    spin_lock_irqsave(&iforce->xmit_lock, flags);

    head = iforce->xmit.head;
    tail = iforce->xmit.tail;


    if (CIRC_SPACE(head, tail, XMIT_SIZE) < n+2) {
        dev_warn(&iforce->dev->dev,
             "not enough space in xmit buffer to send new packet\n");
        spin_unlock_irqrestore(&iforce->xmit_lock, flags);
        return -1;
    }

    empty = head == tail;
    XMIT_INC(iforce->xmit.head, n+2);

/*
 * Store packet in xmit buffer
 */
    iforce->xmit.buf[head] = HI(cmd);
    XMIT_INC(head, 1);
    iforce->xmit.buf[head] = LO(cmd);
    XMIT_INC(head, 1);

    c = CIRC_SPACE_TO_END(head, tail, XMIT_SIZE);
    if (n < c) c=n;

    memcpy(&iforce->xmit.buf[head],
           data,
           c);
    if (n != c) {
        memcpy(&iforce->xmit.buf[0],
               data + c,
               n - c);
    }
    XMIT_INC(head, n);

    spin_unlock_irqrestore(&iforce->xmit_lock, flags);
/*
 * If necessary, start the transmission
 */
    switch (iforce->bus) {

#ifdef CONFIG_JOYSTICK_IFORCE_232
        case IFORCE_232:
        if (empty)
            iforce_serial_xmit(iforce);
        break;
#endif
#ifdef CONFIG_JOYSTICK_IFORCE_USB
        case IFORCE_USB:

        if (iforce->usbdev && empty &&
            !test_and_set_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags)) {

            iforce_usb_xmit(iforce);
        }
        break;
#endif
    }
    return 0;
}

/* Start or stop an effect */
int iforce_control_playback(struct iforce* iforce, u16 id, unsigned int value)
{
    unsigned char data[3];

    data[0] = LO(id);
    data[1] = (value > 0) ? ((value > 1) ? 0x41 : 0x01) : 0;
    data[2] = LO(value);
    return iforce_send_packet(iforce, FF_CMD_PLAY, data);
}

/* Mark an effect that was being updated as ready. That means it can be updated
 * again */
static int mark_core_as_ready(struct iforce *iforce, unsigned short addr)
{
    int i;

    if (!iforce->dev->ff)
        return 0;

    for (i = 0; i < iforce->dev->ff->max_effects; ++i) {
        if (test_bit(FF_CORE_IS_USED, iforce->core_effects[i].flags) &&
            (iforce->core_effects[i].mod1_chunk.start == addr ||
             iforce->core_effects[i].mod2_chunk.start == addr)) {
            clear_bit(FF_CORE_UPDATE, iforce->core_effects[i].flags);
            return 0;
        }
    }
    dev_warn(&iforce->dev->dev, "unused effect %04x updated !!!\n", addr);
    return -1;
}

void iforce_process_packet(struct iforce *iforce, u16 cmd, unsigned char *data)
{
    struct input_dev *dev = iforce->dev;
    int i;
    static int being_used = 0;

    if (being_used)
        dev_warn(&iforce->dev->dev,
             "re-entrant call to iforce_process %d\n", being_used);
    being_used++;

#ifdef CONFIG_JOYSTICK_IFORCE_232
    if (HI(iforce->expect_packet) == HI(cmd)) {
        iforce->expect_packet = 0;
        iforce->ecmd = cmd;
        memcpy(iforce->edata, data, IFORCE_MAX_LENGTH);
    }
#endif
    wake_up(&iforce->wait);

    if (!iforce->type) {
        being_used--;
        return;
    }

    switch (HI(cmd)) {

        case 0x01:  /* joystick position data */
        case 0x03:  /* wheel position data */
            if (HI(cmd) == 1) {
                input_report_abs(dev, ABS_X, (__s16) (((__s16)data[1] << 8) | data[0]));
                input_report_abs(dev, ABS_Y, (__s16) (((__s16)data[3] << 8) | data[2]));
                input_report_abs(dev, ABS_THROTTLE, 255 - data[4]);
                if (LO(cmd) >= 8 && test_bit(ABS_RUDDER ,dev->absbit))
                    input_report_abs(dev, ABS_RUDDER, (__s8)data[7]);
            } else {
                input_report_abs(dev, ABS_WHEEL, (__s16) (((__s16)data[1] << 8) | data[0]));
                input_report_abs(dev, ABS_GAS,   255 - data[2]);
                input_report_abs(dev, ABS_BRAKE, 255 - data[3]);
            }

            input_report_abs(dev, ABS_HAT0X, iforce_hat_to_axis[data[6] >> 4].x);
            input_report_abs(dev, ABS_HAT0Y, iforce_hat_to_axis[data[6] >> 4].y);

            for (i = 0; iforce->type->btn[i] >= 0; i++)
                input_report_key(dev, iforce->type->btn[i], data[(i >> 3) + 5] & (1 << (i & 7)));

            /* If there are untouched bits left, interpret them as the second hat */
            if (i <= 8) {
                int btns = data[6];
                if (test_bit(ABS_HAT1X, dev->absbit)) {
                    if (btns & 8) input_report_abs(dev, ABS_HAT1X, -1);
                    else if (btns & 2) input_report_abs(dev, ABS_HAT1X, 1);
                    else input_report_abs(dev, ABS_HAT1X, 0);
                }
                if (test_bit(ABS_HAT1Y, dev->absbit)) {
                    if (btns & 1) input_report_abs(dev, ABS_HAT1Y, -1);
                    else if (btns & 4) input_report_abs(dev, ABS_HAT1Y, 1);
                    else input_report_abs(dev, ABS_HAT1Y, 0);
                }
            }

            input_sync(dev);

            break;

        case 0x02:  /* status report */
            input_report_key(dev, BTN_DEAD, data[0] & 0x02);
            input_sync(dev);

            /* Check if an effect was just started or stopped */
            i = data[1] & 0x7f;
            if (data[1] & 0x80) {
                if (!test_and_set_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
                    /* Report play event */
                    input_report_ff_status(dev, i, FF_STATUS_PLAYING);
                }
            } else if (test_and_clear_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
                /* Report stop event */
                input_report_ff_status(dev, i, FF_STATUS_STOPPED);
            }
            if (LO(cmd) > 3) {
                int j;
                for (j = 3; j < LO(cmd); j += 2)
                    mark_core_as_ready(iforce, data[j] | (data[j+1]<<8));
            }
            break;
    }
    being_used--;
}

int iforce_get_id_packet(struct iforce *iforce, char *packet)
{
    switch (iforce->bus) {

    case IFORCE_USB: {
#ifdef CONFIG_JOYSTICK_IFORCE_USB
        int status;

        iforce->cr.bRequest = packet[0];
        iforce->ctrl->dev = iforce->usbdev;

        status = usb_submit_urb(iforce->ctrl, GFP_ATOMIC);
        if (status) {
            dev_err(&iforce->intf->dev,
                "usb_submit_urb failed %d\n", status);
            return -1;
        }

        wait_event_interruptible_timeout(iforce->wait,
            iforce->ctrl->status != -EINPROGRESS, HZ);

        if (iforce->ctrl->status) {
            dev_dbg(&iforce->intf->dev,
                "iforce->ctrl->status = %d\n",
                iforce->ctrl->status);
            usb_unlink_urb(iforce->ctrl);
            return -1;
        }
#else
        printk(KERN_DEBUG "iforce_get_id_packet: iforce->bus = USB!\n");
#endif
        }
        break;

    case IFORCE_232:

#ifdef CONFIG_JOYSTICK_IFORCE_232
        iforce->expect_packet = FF_CMD_QUERY;
        iforce_send_packet(iforce, FF_CMD_QUERY, packet);

        wait_event_interruptible_timeout(iforce->wait,
            !iforce->expect_packet, HZ);

        if (iforce->expect_packet) {
            iforce->expect_packet = 0;
            return -1;
        }
#else
        dev_err(&iforce->dev->dev,
            "iforce_get_id_packet: iforce->bus = SERIO!\n");
#endif
        break;

    default:
        dev_err(&iforce->dev->dev,
            "iforce_get_id_packet: iforce->bus = %d\n",
            iforce->bus);
        break;
    }

    return -(iforce->edata[0] != packet[0]);
}