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/*
 * $Id: usbmouse.c,v 1.1 2004-09-13 15:04:47 giacomo Exp $
 *
 *  Copyright (c) 1999-2001 Vojtech Pavlik
 *
 *  USB HIDBP Mouse support
 */

/*
 * 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/kernel.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/usb.h>

/*
 * Version Information
 */
#define DRIVER_VERSION "v1.6"
#define DRIVER_AUTHOR "Vojtech Pavlik <vojtech@ucw.cz>"
#define DRIVER_DESC "USB HID Boot Protocol mouse driver"
#define DRIVER_LICENSE "GPL"

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE(DRIVER_LICENSE);

struct usb_mouse {
        char name[128];
        char phys[64];
        struct usb_device *usbdev;
        struct input_dev dev;
        struct urb *irq;
        int open;

        signed char *data;
        dma_addr_t data_dma;
};

static void usb_mouse_irq(struct urb *urb, struct pt_regs *regs)
{
        struct usb_mouse *mouse = urb->context;
        signed char *data = mouse->data;
        struct input_dev *dev = &mouse->dev;
        int status;

        switch (urb->status) {
        case 0:                 /* success */
                break;
        case -ECONNRESET:       /* unlink */
        case -ENOENT:
        case -ESHUTDOWN:
                return;
        /* -EPIPE:  should clear the halt */
        default:                /* error */
                goto resubmit;
        }

        input_regs(dev, regs);

        input_report_key(dev, BTN_LEFT,   data[0] & 0x01);
        input_report_key(dev, BTN_RIGHT,  data[0] & 0x02);
        input_report_key(dev, BTN_MIDDLE, data[0] & 0x04);
        input_report_key(dev, BTN_SIDE,   data[0] & 0x08);
        input_report_key(dev, BTN_EXTRA,  data[0] & 0x10);

        input_report_rel(dev, REL_X,     data[1]);
        input_report_rel(dev, REL_Y,     data[2]);
        input_report_rel(dev, REL_WHEEL, data[3]);

        input_sync(dev);
resubmit:
        status = usb_submit_urb (urb, SLAB_ATOMIC);
        if (status)
                err ("can't resubmit intr, %s-%s/input0, status %d",
                                mouse->usbdev->bus->bus_name,
                                mouse->usbdev->devpath, status);
}

static int usb_mouse_open(struct input_dev *dev)
{
        struct usb_mouse *mouse = dev->private;

        if (mouse->open++)
                return 0;

        mouse->irq->dev = mouse->usbdev;
        if (usb_submit_urb(mouse->irq, GFP_KERNEL)) {
                mouse->open--;
                return -EIO;
        }

        return 0;
}

static void usb_mouse_close(struct input_dev *dev)
{
        struct usb_mouse *mouse = dev->private;

        if (!--mouse->open)
                usb_unlink_urb(mouse->irq);
}

static int usb_mouse_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 *endpoint;
        struct usb_mouse *mouse;
        int pipe, maxp;
        char path[64];
        char *buf;

        interface = &intf->altsetting[intf->act_altsetting];

        if (interface->desc.bNumEndpoints != 1)
                return -ENODEV;

        endpoint = &interface->endpoint[0].desc;
        if (!(endpoint->bEndpointAddress & 0x80))
                return -ENODEV;
        if ((endpoint->bmAttributes & 3) != 3)
                return -ENODEV;

        pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress);
        maxp = usb_maxpacket(dev, pipe, usb_pipeout(pipe));

        if (!(mouse = kmalloc(sizeof(struct usb_mouse), GFP_KERNEL)))
                return -ENOMEM;
        memset(mouse, 0, sizeof(struct usb_mouse));

        mouse->data = usb_buffer_alloc(dev, 8, SLAB_ATOMIC, &mouse->data_dma);
        if (!mouse->data) {
                kfree(mouse);
                return -ENOMEM;
        }

        mouse->irq = usb_alloc_urb(0, GFP_KERNEL);
        if (!mouse->irq) {
                usb_buffer_free(dev, 8, mouse->data, mouse->data_dma);
                kfree(mouse);
                return -ENODEV;
        }

        mouse->usbdev = dev;

        mouse->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_REL);
        mouse->dev.keybit[LONG(BTN_MOUSE)] = BIT(BTN_LEFT) | BIT(BTN_RIGHT) | BIT(BTN_MIDDLE);
        mouse->dev.relbit[0] = BIT(REL_X) | BIT(REL_Y);
        mouse->dev.keybit[LONG(BTN_MOUSE)] |= BIT(BTN_SIDE) | BIT(BTN_EXTRA);
        mouse->dev.relbit[0] |= BIT(REL_WHEEL);

        mouse->dev.private = mouse;
        mouse->dev.open = usb_mouse_open;
        mouse->dev.close = usb_mouse_close;

        usb_make_path(dev, path, 64);
        sprintf26(mouse->phys, "%s/input0", path);

        mouse->dev.name = mouse->name;
        mouse->dev.phys = mouse->phys;
        mouse->dev.id.bustype = BUS_USB;
        mouse->dev.id.vendor = dev->descriptor.idVendor;
        mouse->dev.id.product = dev->descriptor.idProduct;
        mouse->dev.id.version = dev->descriptor.bcdDevice;

        if (!(buf = kmalloc(63, GFP_KERNEL))) {
                usb_buffer_free(dev, 8, mouse->data, mouse->data_dma);
                kfree(mouse);
                return -ENOMEM;
        }

        if (dev->descriptor.iManufacturer &&
                usb_string(dev, dev->descriptor.iManufacturer, buf, 63) > 0)
                        strcat(mouse->name, buf);
        if (dev->descriptor.iProduct &&
                usb_string(dev, dev->descriptor.iProduct, buf, 63) > 0)
                        sprintf26(mouse->name, "%s %s", mouse->name, buf);

        if (!strlen(mouse->name))
                sprintf26(mouse->name, "USB HIDBP Mouse %04x:%04x",
                        mouse->dev.id.vendor, mouse->dev.id.product);

        kfree(buf);

        usb_fill_int_urb(mouse->irq, dev, pipe, mouse->data,
                         (maxp > 8 ? 8 : maxp),
                         usb_mouse_irq, mouse, endpoint->bInterval);
        mouse->irq->transfer_dma = mouse->data_dma;
        mouse->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

        input_register_device(&mouse->dev);
        printk(KERN_INFO "input: %s on %s\n", mouse->name, path);

        usb_set_intfdata(intf, mouse);
        return 0;
}

static void usb_mouse_disconnect(struct usb_interface *intf)
{
        struct usb_mouse *mouse = usb_get_intfdata (intf);
       
        usb_set_intfdata(intf, NULL);
        if (mouse) {
                usb_unlink_urb(mouse->irq);
                input_unregister_device(&mouse->dev);
                usb_free_urb(mouse->irq);
                usb_buffer_free(interface_to_usbdev(intf), 8, mouse->data, mouse->data_dma);
                kfree(mouse);
        }
}

static struct usb_device_id usb_mouse_id_table [] = {
        { USB_INTERFACE_INFO(3, 1, 2) },
    { }                                         /* Terminating entry */
};

MODULE_DEVICE_TABLE (usb, usb_mouse_id_table);

static struct usb_driver usb_mouse_driver = {
        .owner          = THIS_MODULE,
        .name           = "usbmouse",
        .probe          = usb_mouse_probe,
        .disconnect     = usb_mouse_disconnect,
        .id_table       = usb_mouse_id_table,
};

/*static*/ int __init usb_mouse_init(void)
{
        int retval = usb_register(&usb_mouse_driver);
        if (retval == 0)
                info(DRIVER_VERSION ":" DRIVER_DESC);
        return retval;
}

/*static*/ void __exit usb_mouse_exit(void)
{
        usb_deregister(&usb_mouse_driver);
}

module_init(usb_mouse_init);
module_exit(usb_mouse_exit);