iforce-usb.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"

void iforce_usb_xmit(struct iforce *iforce)
{
    int n, c;
    unsigned long flags;

    spin_lock_irqsave(&iforce->xmit_lock, flags);

    if (iforce->xmit.head == iforce->xmit.tail) {
        clear_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags);
        spin_unlock_irqrestore(&iforce->xmit_lock, flags);
        return;
    }

    ((char *)iforce->out->transfer_buffer)[0] = iforce->xmit.buf[iforce->xmit.tail];
    XMIT_INC(iforce->xmit.tail, 1);
    n = iforce->xmit.buf[iforce->xmit.tail];
    XMIT_INC(iforce->xmit.tail, 1);

    iforce->out->transfer_buffer_length = n + 1;
    iforce->out->dev = iforce->usbdev;

    /* Copy rest of data then */
    c = CIRC_CNT_TO_END(iforce->xmit.head, iforce->xmit.tail, XMIT_SIZE);
    if (n < c) c=n;

    memcpy(iforce->out->transfer_buffer + 1,
           &iforce->xmit.buf[iforce->xmit.tail],
           c);
    if (n != c) {
        memcpy(iforce->out->transfer_buffer + 1 + c,
               &iforce->xmit.buf[0],
               n-c);
    }
    XMIT_INC(iforce->xmit.tail, n);

    if ( (n=usb_submit_urb(iforce->out, GFP_ATOMIC)) ) {
        clear_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags);
        dev_warn(&iforce->intf->dev, "usb_submit_urb failed %d\n", n);
    }

    /* The IFORCE_XMIT_RUNNING bit is not cleared here. That's intended.
     * As long as the urb completion handler is not called, the transmiting
     * is considered to be running */
    spin_unlock_irqrestore(&iforce->xmit_lock, flags);
}

static void iforce_usb_irq(struct urb *urb)
{
    struct iforce *iforce = urb->context;
    struct device *dev = &iforce->intf->dev;
    int status;

    switch (urb->status) {
    case 0:
        /* success */
        break;
    case -ECONNRESET:
    case -ENOENT:
    case -ESHUTDOWN:
        /* this urb is terminated, clean up */
        dev_dbg(dev, "%s - urb shutting down with status: %d\n",
            __func__, urb->status);
        return;
    default:
        dev_dbg(dev, "%s - urb has status of: %d\n",
            __func__, urb->status);
        goto exit;
    }

    iforce_process_packet(iforce,
        (iforce->data[0] << 8) | (urb->actual_length - 1), iforce->data + 1);

exit:
    status = usb_submit_urb (urb, GFP_ATOMIC);
    if (status)
        dev_err(dev, "%s - usb_submit_urb failed with result %d\n",
            __func__, status);
}

static void iforce_usb_out(struct urb *urb)
{
    struct iforce *iforce = urb->context;

    if (urb->status) {
        clear_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags);
        dev_dbg(&iforce->intf->dev, "urb->status %d, exiting\n",
            urb->status);
        return;
    }

    iforce_usb_xmit(iforce);

    wake_up(&iforce->wait);
}

static void iforce_usb_ctrl(struct urb *urb)
{
    struct iforce *iforce = urb->context;
    if (urb->status) return;
    iforce->ecmd = 0xff00 | urb->actual_length;
    wake_up(&iforce->wait);
}

static int iforce_usb_probe(struct usb_interface *intf,
                const struct usb_device_id *id)
{
    struct usb_device *dev = interface_to_usbdev(intf);
    struct usb_host_interface *interface;
    struct usb_endpoint_descriptor *epirq, *epout;
    struct iforce *iforce;
    int err = -ENOMEM;

    interface = intf->cur_altsetting;

    epirq = &interface->endpoint[0].desc;
    epout = &interface->endpoint[1].desc;

    if (!(iforce = kzalloc(sizeof(struct iforce) + 32, GFP_KERNEL)))
        goto fail;

    if (!(iforce->irq = usb_alloc_urb(0, GFP_KERNEL)))
        goto fail;

    if (!(iforce->out = usb_alloc_urb(0, GFP_KERNEL)))
        goto fail;

    if (!(iforce->ctrl = usb_alloc_urb(0, GFP_KERNEL)))
        goto fail;

    iforce->bus = IFORCE_USB;
    iforce->usbdev = dev;
    iforce->intf = intf;

    iforce->cr.bRequestType = USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_INTERFACE;
    iforce->cr.wIndex = 0;
    iforce->cr.wLength = cpu_to_le16(16);

    usb_fill_int_urb(iforce->irq, dev, usb_rcvintpipe(dev, epirq->bEndpointAddress),
            iforce->data, 16, iforce_usb_irq, iforce, epirq->bInterval);

    usb_fill_int_urb(iforce->out, dev, usb_sndintpipe(dev, epout->bEndpointAddress),
            iforce + 1, 32, iforce_usb_out, iforce, epout->bInterval);

    usb_fill_control_urb(iforce->ctrl, dev, usb_rcvctrlpipe(dev, 0),
            (void*) &iforce->cr, iforce->edata, 16, iforce_usb_ctrl, iforce);

    err = iforce_init_device(iforce);
    if (err)
        goto fail;

    usb_set_intfdata(intf, iforce);
    return 0;

fail:
    if (iforce) {
        usb_free_urb(iforce->irq);
        usb_free_urb(iforce->out);
        usb_free_urb(iforce->ctrl);
        kfree(iforce);
    }

    return err;
}

static void iforce_usb_disconnect(struct usb_interface *intf)
{
    struct iforce *iforce = usb_get_intfdata(intf);

    usb_set_intfdata(intf, NULL);

    input_unregister_device(iforce->dev);

    usb_free_urb(iforce->irq);
    usb_free_urb(iforce->out);
    usb_free_urb(iforce->ctrl);

    kfree(iforce);
}

static struct usb_device_id iforce_usb_ids [] = {
    { USB_DEVICE(0x044f, 0xa01c) },     /* Thrustmaster Motor Sport GT */
    { USB_DEVICE(0x046d, 0xc281) },     /* Logitech WingMan Force */
    { USB_DEVICE(0x046d, 0xc291) },     /* Logitech WingMan Formula Force */
    { USB_DEVICE(0x05ef, 0x020a) },     /* AVB Top Shot Pegasus */
    { USB_DEVICE(0x05ef, 0x8884) },     /* AVB Mag Turbo Force */
    { USB_DEVICE(0x05ef, 0x8888) },     /* AVB Top Shot FFB Racing Wheel */
    { USB_DEVICE(0x061c, 0xc0a4) },         /* ACT LABS Force RS */
    { USB_DEVICE(0x061c, 0xc084) },         /* ACT LABS Force RS */
    { USB_DEVICE(0x06f8, 0x0001) },     /* Guillemot Race Leader Force Feedback */
    { USB_DEVICE(0x06f8, 0x0003) },     /* Guillemot Jet Leader Force Feedback */
    { USB_DEVICE(0x06f8, 0x0004) },     /* Guillemot Force Feedback Racing Wheel */
    { USB_DEVICE(0x06f8, 0xa302) },     /* Guillemot Jet Leader 3D */
    { }                 /* Terminating entry */
};

MODULE_DEVICE_TABLE (usb, iforce_usb_ids);

struct usb_driver iforce_usb_driver = {
    .name =     "iforce",
    .probe =    iforce_usb_probe,
    .disconnect =   iforce_usb_disconnect,
    .id_table = iforce_usb_ids,
};