// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (c) 1999-2001 Vojtech Pavlik
 *
 *  USB HIDBP Mouse support
 */

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

/* for apple IDs */
#ifdef CONFIG_USB_HID_MODULE
#include "../hid-ids.h"
#endif

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

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

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

        signed char *data;
        dma_addr_t data_dma;
};

static void usb_mouse_irq(struct urb *urb)
{
        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_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, GFP_ATOMIC);
        if (status)
                dev_err(&mouse->usbdev->dev,
                        "can't resubmit intr, %s-%s/input0, status %d\n",
                        mouse->usbdev->bus->bus_name,
                        mouse->usbdev->devpath, status);
}

static int usb_mouse_open(struct input_dev *dev)
{
        struct usb_mouse *mouse = input_get_drvdata(dev);

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

        return 0;
}

static void usb_mouse_close(struct input_dev *dev)
{
        struct usb_mouse *mouse = input_get_drvdata(dev);

        usb_kill_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;
        struct input_dev *input_dev;
        int pipe, maxp;
        int error = -ENOMEM;

        interface = intf->cur_altsetting;

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

        endpoint = &interface->endpoint[0].desc;
        if (!usb_endpoint_is_int_in(endpoint))
                return -ENODEV;

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

        mouse = kzalloc_obj(struct usb_mouse);
        input_dev = input_allocate_device();
        if (!mouse || !input_dev)
                goto fail1;

        mouse->data = usb_alloc_coherent(dev, 8, GFP_KERNEL, &mouse->data_dma);
        if (!mouse->data)
                goto fail1;

        mouse->irq = usb_alloc_urb(0, GFP_KERNEL);
        if (!mouse->irq)
                goto fail2;

        mouse->usbdev = dev;
        mouse->dev = input_dev;

        if (dev->manufacturer)
                strscpy(mouse->name, dev->manufacturer, sizeof(mouse->name));

        if (dev->product) {
                if (dev->manufacturer)
                        strlcat(mouse->name, " ", sizeof(mouse->name));
                strlcat(mouse->name, dev->product, sizeof(mouse->name));
        }

        if (!strlen(mouse->name))
                snprintf(mouse->name, sizeof(mouse->name),
                         "USB HIDBP Mouse %04x:%04x",
                         le16_to_cpu(dev->descriptor.idVendor),
                         le16_to_cpu(dev->descriptor.idProduct));

        usb_make_path(dev, mouse->phys, sizeof(mouse->phys));
        strlcat(mouse->phys, "/input0", sizeof(mouse->phys));

        input_dev->name = mouse->name;
        input_dev->phys = mouse->phys;
        usb_to_input_id(dev, &input_dev->id);
        input_dev->dev.parent = &intf->dev;

        input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
        input_dev->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
                BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
        input_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
        input_dev->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_SIDE) |
                BIT_MASK(BTN_EXTRA);
        input_dev->relbit[0] |= BIT_MASK(REL_WHEEL);

        input_set_drvdata(input_dev, mouse);

        input_dev->open = usb_mouse_open;
        input_dev->close = usb_mouse_close;

        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;

        error = input_register_device(mouse->dev);
        if (error)
                goto fail3;

        usb_set_intfdata(intf, mouse);
        return 0;

fail3:  
        usb_free_urb(mouse->irq);
fail2:  
        usb_free_coherent(dev, 8, mouse->data, mouse->data_dma);
fail1:  
        input_free_device(input_dev);
        kfree(mouse);
        return error;
}

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_kill_urb(mouse->irq);
                input_unregister_device(mouse->dev);
                usb_free_urb(mouse->irq);
                usb_free_coherent(interface_to_usbdev(intf), 8, mouse->data, mouse->data_dma);
                kfree(mouse);
        }
}

static const struct usb_device_id usb_mouse_id_table[] = {
        { USB_INTERFACE_INFO(USB_INTERFACE_CLASS_HID, USB_INTERFACE_SUBCLASS_BOOT,
                USB_INTERFACE_PROTOCOL_MOUSE) },
        { }     /* Terminating entry */
};

MODULE_DEVICE_TABLE (usb, usb_mouse_id_table);

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

module_usb_driver(usb_mouse_driver);