usb-hid.c

qemu虚拟机代码

    s->dx -= dx;
    s->dy -= dy;
    s->dz -= dz;
    
    b = 0;
    if (s->buttons_state & MOUSE_EVENT_LBUTTON)
        b |= 0x01;
    if (s->buttons_state & MOUSE_EVENT_RBUTTON)
        b |= 0x02;
    if (s->buttons_state & MOUSE_EVENT_MBUTTON)
        b |= 0x04;
    
    buf[0] = b;
    buf[1] = dx;
    buf[2] = dy;
    l = 3;
    if (len >= 4) {
        buf[3] = dz;
        l = 4;
    }
    return l;
}

static int usb_tablet_poll(USBMouseState *s, uint8_t *buf, int len)
{
    int dz, b, l;

    if (!s->mouse_grabbed) {
	qemu_add_mouse_event_handler(usb_tablet_event, s, 1);
	s->mouse_grabbed = 1;
    }
    
    dz = int_clamp(s->dz, -128, 127);
    s->dz -= dz;

    /* Appears we have to invert the wheel direction */
    dz = 0 - dz;
    b = 0;
    if (s->buttons_state & MOUSE_EVENT_LBUTTON)
        b |= 0x01;
    if (s->buttons_state & MOUSE_EVENT_RBUTTON)
        b |= 0x02;
    if (s->buttons_state & MOUSE_EVENT_MBUTTON)
        b |= 0x04;

    buf[0] = b;
    buf[1] = s->x & 0xff;
    buf[2] = s->x >> 8;
    buf[3] = s->y & 0xff;
    buf[4] = s->y >> 8;
    buf[5] = dz;
    l = 6;

    return l;
}

static void usb_mouse_handle_reset(USBDevice *dev)
{
    USBMouseState *s = (USBMouseState *)dev;

    s->dx = 0;
    s->dy = 0;
    s->dz = 0;
    s->x = 0;
    s->y = 0;
    s->buttons_state = 0;
}

static int usb_mouse_handle_control(USBDevice *dev, int request, int value,
                                  int index, int length, uint8_t *data)
{
    USBMouseState *s = (USBMouseState *)dev;
    int ret = 0;

    switch(request) {
    case DeviceRequest | USB_REQ_GET_STATUS:
        data[0] = (1 << USB_DEVICE_SELF_POWERED) |
            (dev->remote_wakeup << USB_DEVICE_REMOTE_WAKEUP);
        data[1] = 0x00;
        ret = 2;
        break;
    case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
        if (value == USB_DEVICE_REMOTE_WAKEUP) {
            dev->remote_wakeup = 0;
        } else {
            goto fail;
        }
        ret = 0;
        break;
    case DeviceOutRequest | USB_REQ_SET_FEATURE:
        if (value == USB_DEVICE_REMOTE_WAKEUP) {
            dev->remote_wakeup = 1;
        } else {
            goto fail;
        }
        ret = 0;
        break;
    case DeviceOutRequest | USB_REQ_SET_ADDRESS:
        dev->addr = value;
        ret = 0;
        break;
    case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
        switch(value >> 8) {
        case USB_DT_DEVICE:
            memcpy(data, qemu_mouse_dev_descriptor, 
                   sizeof(qemu_mouse_dev_descriptor));
            ret = sizeof(qemu_mouse_dev_descriptor);
            break;
        case USB_DT_CONFIG:
	    if (s->kind == USB_MOUSE) {
		memcpy(data, qemu_mouse_config_descriptor, 
		       sizeof(qemu_mouse_config_descriptor));
		ret = sizeof(qemu_mouse_config_descriptor);
	    } else if (s->kind == USB_TABLET) {
		memcpy(data, qemu_tablet_config_descriptor, 
		       sizeof(qemu_tablet_config_descriptor));
		ret = sizeof(qemu_tablet_config_descriptor);
	    }		
            break;
        case USB_DT_STRING:
            switch(value & 0xff) {
            case 0:
                /* language ids */
                data[0] = 4;
                data[1] = 3;
                data[2] = 0x09;
                data[3] = 0x04;
                ret = 4;
                break;
            case 1:
                /* serial number */
                ret = set_usb_string(data, "1");
                break;
            case 2:
                /* product description */
		if (s->kind == USB_MOUSE)
		    ret = set_usb_string(data, "QEMU USB Mouse");
		else if (s->kind == USB_TABLET)
		    ret = set_usb_string(data, "QEMU USB Tablet");
                break;
            case 3:
                /* vendor description */
                ret = set_usb_string(data, "QEMU " QEMU_VERSION);
                break;
            case 4:
                ret = set_usb_string(data, "HID Mouse");
                break;
            case 5:
                ret = set_usb_string(data, "Endpoint1 Interrupt Pipe");
                break;
            default:
                goto fail;
            }
            break;
        default:
            goto fail;
        }
        break;
    case DeviceRequest | USB_REQ_GET_CONFIGURATION:
        data[0] = 1;
        ret = 1;
        break;
    case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
        ret = 0;
        break;
    case DeviceRequest | USB_REQ_GET_INTERFACE:
        data[0] = 0;
        ret = 1;
        break;
    case DeviceOutRequest | USB_REQ_SET_INTERFACE:
        ret = 0;
        break;
        /* hid specific requests */
    case InterfaceRequest | USB_REQ_GET_DESCRIPTOR:
        switch(value >> 8) {
        case 0x22:
	    if (s->kind == USB_MOUSE) {
		memcpy(data, qemu_mouse_hid_report_descriptor, 
		       sizeof(qemu_mouse_hid_report_descriptor));
		ret = sizeof(qemu_mouse_hid_report_descriptor);
	    } else if (s->kind == USB_TABLET) {
		memcpy(data, qemu_tablet_hid_report_descriptor, 
		       sizeof(qemu_tablet_hid_report_descriptor));
		ret = sizeof(qemu_tablet_hid_report_descriptor);
	    }
	    break;
        default:
            goto fail;
        }
        break;
    case GET_REPORT:
	if (s->kind == USB_MOUSE)
	    ret = usb_mouse_poll(s, data, length);
	else if (s->kind == USB_TABLET)
	    ret = usb_tablet_poll(s, data, length);
        break;
    case SET_IDLE:
        ret = 0;
        break;
    default:
    fail:
        ret = USB_RET_STALL;
        break;
    }
    return ret;
}

static int usb_mouse_handle_data(USBDevice *dev, int pid, 
                                 uint8_t devep, uint8_t *data, int len)
{
    USBMouseState *s = (USBMouseState *)dev;
    int ret = 0;

    switch(pid) {
    case USB_TOKEN_IN:
        if (devep == 1) {
	    if (s->kind == USB_MOUSE)
		ret = usb_mouse_poll(s, data, len);
	    else if (s->kind == USB_TABLET)
		ret = usb_tablet_poll(s, data, len);
        } else {
            goto fail;
        }
        break;
    case USB_TOKEN_OUT:
    default:
    fail:
        ret = USB_RET_STALL;
        break;
    }
    return ret;
}

USBDevice *usb_tablet_init(void)
{
    USBMouseState *s;

    s = qemu_mallocz(sizeof(USBMouseState));
    if (!s)
        return NULL;
    s->dev.speed = USB_SPEED_FULL;
    s->dev.handle_packet = usb_generic_handle_packet;

    s->dev.handle_reset = usb_mouse_handle_reset;
    s->dev.handle_control = usb_mouse_handle_control;
    s->dev.handle_data = usb_mouse_handle_data;
    s->kind = USB_TABLET;

    return (USBDevice *)s;
}

USBDevice *usb_mouse_init(void)
{
    USBMouseState *s;

    s = qemu_mallocz(sizeof(USBMouseState));
    if (!s)
        return NULL;
    s->dev.speed = USB_SPEED_FULL;
    s->dev.handle_packet = usb_generic_handle_packet;

    s->dev.handle_reset = usb_mouse_handle_reset;
    s->dev.handle_control = usb_mouse_handle_control;
    s->dev.handle_data = usb_mouse_handle_data;
    s->kind = USB_MOUSE;

    return (USBDevice *)s;
}