usb-hid.c

xen虚拟机源代码安装包

static void usb_keyboard_event(void *opaque, int keycode)
{
    USBHIDState *hs = opaque;
    USBKeyboardState *s = &hs->kbd;
    uint8_t hid_code, key;
    int i;

    key = keycode & 0x7f;
    hid_code = usb_hid_usage_keys[key | ((s->modifiers >> 1) & (1 << 7))];
    s->modifiers &= ~(1 << 8);

    s->changed = 1;

    switch (hid_code) {
    case 0x00:
        return;

    case 0xe0:
        if (s->modifiers & (1 << 9)) {
            s->modifiers ^= 3 << 8;
            return;
        }
    case 0xe1 ... 0xe7:
        if (keycode & (1 << 7)) {
            s->modifiers &= ~(1 << (hid_code & 0x0f));
            return;
        }
    case 0xe8 ... 0xef:
        s->modifiers |= 1 << (hid_code & 0x0f);
        return;
    }

    if (keycode & (1 << 7)) {
        for (i = s->keys - 1; i >= 0; i --)
            if (s->key[i] == hid_code) {
                s->key[i] = s->key[-- s->keys];
                s->key[s->keys] = 0x00;
                return;
            }
    } else {
        for (i = s->keys - 1; i >= 0; i --)
            if (s->key[i] == hid_code)
                return;
        if (s->keys < sizeof(s->key))
            s->key[s->keys ++] = hid_code;
    }
}

static inline int int_clamp(int val, int vmin, int vmax)
{
    if (val < vmin)
        return vmin;
    else if (val > vmax)
        return vmax;
    else
        return val;
}

static int usb_suppress_report(USBHIDState *hs, int unchanged) {
    /* TODO: Implement finite idle delays.  */
    if (!hs->idle) return 0; /* SET_IDLE 0 means always report */
    return unchanged;
}

static int usb_pointer_poll(USBHIDState *hs, uint8_t *buf, int len)
{
    int dx, dy, dz, b, l;
    USBPointerState *s = &hs->ptr;
    USBPointerEvent *e;

    if (usb_suppress_report(hs, s->head == s->tail))
	return USB_RET_NAK;

    if (!s->mouse_grabbed) {
	s->eh_entry = qemu_add_mouse_event_handler(usb_pointer_event, hs,
                                          !s->xyrel, "QEMU USB Pointer");
	s->mouse_grabbed = 1;
    }

    if (s->head == s->tail)
        /* use the last report */
        s->head = (s->head - 1) & QUEUEINDEXMASK;

    e = &s->queue[s->head];

    dz = int_clamp(e->dz, -127, 127);

    if (s->xyrel) {
        dx = int_clamp(e->xdx, -127, 127);
        dy = int_clamp(e->ydy, -127, 127);
	e->xdx -= dx;
	e->ydy -= dy;
    } else {
        dx = e->xdx;
        dy = e->ydy;
    }
    /* Appears we have to invert the wheel direction */
    dz = 0 - dz;

    if (!(e->dz ||
	  (s->xyrel && (e->xdx || e->ydy)))) {
	/* that deals with this event */
	QUEUE_INCR(s->head);
    }

    b = 0;
    if (e->buttons_state & MOUSE_EVENT_LBUTTON)
        b |= 0x01;
    if (e->buttons_state & MOUSE_EVENT_RBUTTON)
        b |= 0x02;
    if (e->buttons_state & MOUSE_EVENT_MBUTTON)
        b |= 0x04;

    switch (hs->kind) {
    case USB_MOUSE:
	l = 0;
	if (len > l)
	    buf[l ++] = b;
	if (len > l)
	    buf[l ++] = dx;
	if (len > l)
	    buf[l ++] = dy;
	if (len > l)
	    buf[l ++] = dz;
	break;

    case USB_TABLET:
	/* Appears we have to invert the wheel direction */
	dz = 0 - dz;

	buf[0] = b;
	buf[1] = dx & 0xff;
	buf[2] = dx >> 8;
	buf[3] = dy & 0xff;
	buf[4] = dy >> 8;
	buf[5] = dz;
	l = 6;
	break;

    default:
	abort();
    }

    return l;
}

static int usb_keyboard_poll(USBHIDState *hs, uint8_t *buf, int len)
{
    USBKeyboardState *s= &hs->kbd;

    if (usb_suppress_report(hs, !s->changed))
	return USB_RET_NAK;

    s->changed= 0;

    if (len < 2)
        return 0;

    buf[0] = s->modifiers & 0xff;
    buf[1] = 0;
    if (s->keys > 6)
        memset(buf + 2, USB_HID_USAGE_ERROR_ROLLOVER, MIN(8, len) - 2);
    else
        memcpy(buf + 2, s->key, MIN(8, len) - 2);

    return MIN(8, len);
}

static int usb_keyboard_write(USBKeyboardState *s, uint8_t *buf, int len)
{
    if (len > 0) {
        /* 0x01: Num Lock LED
         * 0x02: Caps Lock LED
         * 0x04: Scroll Lock LED
         * 0x08: Compose LED
         * 0x10: Kana LED */
        s->leds = buf[0];
    }
    return 0;
}

static void usb_pointer_handle_reset(USBDevice *dev)
{
    USBHIDState *s = (USBHIDState *)dev;

    s->ptr.head= s->ptr.tail = 0;
    s->protocol = 1;
}

static void usb_keyboard_handle_reset(USBDevice *dev)
{
    USBHIDState *s = (USBHIDState *)dev;

    qemu_add_kbd_event_handler(usb_keyboard_event, s);
    s->protocol = 1;
}

static int usb_hid_handle_control(USBDevice *dev, int request, int value,
                                  int index, int length, uint8_t *data)
{
    USBHIDState *s = (USBHIDState *)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);
            } else if (s->kind == USB_KEYBOARD) {
                memcpy(data, qemu_keyboard_config_descriptor,
                       sizeof(qemu_keyboard_config_descriptor));
                ret = sizeof(qemu_keyboard_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 */
                ret = set_usb_string(data, s->dev.devname);
                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, "HID Tablet");
                break;
            case 6:
                ret = set_usb_string(data, "HID Keyboard");
                break;
            case 7:
                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);
            } else if (s->kind == USB_KEYBOARD) {
                memcpy(data, qemu_keyboard_hid_report_descriptor,
                       sizeof(qemu_keyboard_hid_report_descriptor));
                ret = sizeof(qemu_keyboard_hid_report_descriptor);
            }
            break;
        default:
            goto fail;
        }
        break;
    case GET_REPORT:
	if (s->kind == USB_MOUSE || s->kind == USB_TABLET)
            ret = usb_pointer_poll(s, data, length);
        else if (s->kind == USB_KEYBOARD)
            ret = usb_keyboard_poll(s, data, length);
        break;
    case SET_REPORT:
        if (s->kind == USB_KEYBOARD)
            ret = usb_keyboard_write(&s->kbd, data, length);
        else
            goto fail;
        break;
    case GET_PROTOCOL:
        if (s->kind != USB_KEYBOARD)
            goto fail;
        ret = 1;
        data[0] = s->protocol;
        break;
    case SET_PROTOCOL:
        if (s->kind != USB_KEYBOARD)
            goto fail;
        ret = 0;
        s->protocol = value;
        break;
    case GET_IDLE:
        ret = 1;
        data[0] = s->idle;
        break;
    case SET_IDLE:
        s->idle = value;
        ret = 0;
        break;
    default:
    fail:
        ret = USB_RET_STALL;
        break;
    }
    return ret;
}

static int usb_hid_handle_data(USBDevice *dev, USBPacket *p)
{
    USBHIDState *s = (USBHIDState *)dev;
    int ret = 0;

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

static void usb_hid_handle_destroy(USBDevice *dev)
{
    USBHIDState *s = (USBHIDState *)dev;

    if (s->kind != USB_KEYBOARD)
        qemu_remove_mouse_event_handler(s->ptr.eh_entry);
    /* TODO: else */
    qemu_free(s);
}

static USBDevice *usb_pointer_init(int kind, int xyrel, const char *devname)
{
    USBHIDState *s;

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

    s->dev.handle_reset = usb_pointer_handle_reset;
    s->dev.handle_control = usb_hid_handle_control;
    s->dev.handle_data = usb_hid_handle_data;
    s->dev.handle_destroy = usb_hid_handle_destroy;

    s->kind = kind;
    s->ptr.xyrel = xyrel;
    usb_pointer_handle_reset((USBDevice*)s);

    /* Force poll routine to be run and grab input the first time.  */
    usb_pointer_event_clear(&s->ptr.queue[0], 0);
    s->ptr.tail = 1;

    pstrcpy(s->dev.devname, sizeof(s->dev.devname), devname);
    return (USBDevice *)s;
}

USBDevice *usb_tablet_init(void)
{
    return usb_pointer_init(USB_TABLET, 0, "QEMU USB Tablet");
}

USBDevice *usb_mouse_init(void)
{
    return usb_pointer_init(USB_MOUSE, 1, "QEMU USB Mouse");
}

USBDevice *usb_keyboard_init(void)
{
    USBHIDState *s;

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

    s->dev.handle_reset = usb_keyboard_handle_reset;
    s->dev.handle_control = usb_hid_handle_control;
    s->dev.handle_data = usb_hid_handle_data;
    s->dev.handle_destroy = usb_hid_handle_destroy;
    s->kind = USB_KEYBOARD;
    s->kbd.changed= 0;

    pstrcpy(s->dev.devname, sizeof(s->dev.devname), "QEMU USB Keyboard");

    return (USBDevice *) s;
}