+#ifdef MULTI_PACKET
+static void usbtouch_process_multi(struct usbtouch_usb *usbtouch,
+ struct pt_regs *regs,
+ unsigned char *pkt, int len)
+{
+ unsigned char *buffer;
+ int pkt_len, pos, buf_len, tmp;
+
+ /* process buffer */
+ if (unlikely(usbtouch->buf_len)) {
+ /* try to get size */
+ pkt_len = usbtouch->type->get_pkt_len(
+ usbtouch->buffer, usbtouch->buf_len);
+
+ /* drop? */
+ if (unlikely(!pkt_len))
+ goto out_flush_buf;
+
+ /* need to append -pkt_len bytes before able to get size */
+ if (unlikely(pkt_len < 0)) {
+ int append = -pkt_len;
+ if (unlikely(append > len))
+ append = len;
+ if (usbtouch->buf_len + append >= usbtouch->type->rept_size)
+ goto out_flush_buf;
+ memcpy(usbtouch->buffer + usbtouch->buf_len, pkt, append);
+ usbtouch->buf_len += append;
+
+ pkt_len = usbtouch->type->get_pkt_len(
+ usbtouch->buffer, usbtouch->buf_len);
+ if (pkt_len < 0)
+ return;
+ }
+
+ /* append */
+ tmp = pkt_len - usbtouch->buf_len;
+ if (usbtouch->buf_len + tmp >= usbtouch->type->rept_size)
+ goto out_flush_buf;
+ memcpy(usbtouch->buffer + usbtouch->buf_len, pkt, tmp);
+ usbtouch_process_pkt(usbtouch, regs, usbtouch->buffer, pkt_len);
+
+ buffer = pkt + tmp;
+ buf_len = len - tmp;
+ } else {
+ buffer = pkt;
+ buf_len = len;
+ }
+
+ /* loop over the received packet, process */
+ pos = 0;
+ while (pos < buf_len) {
+ /* get packet len */
+ pkt_len = usbtouch->type->get_pkt_len(buffer + pos, len);
+
+ /* unknown packet: drop everything */
+ if (unlikely(!pkt_len))
+ goto out_flush_buf;
+
+ /* full packet: process */
+ if (likely((pkt_len > 0) && (pkt_len <= buf_len - pos))) {
+ usbtouch_process_pkt(usbtouch, regs, buffer + pos, pkt_len);
+ } else {
+ /* incomplete packet: save in buffer */
+ memcpy(usbtouch->buffer, buffer + pos, buf_len - pos);
+ usbtouch->buf_len = buf_len - pos;
+ return;
+ }
+ pos += pkt_len;
+ }
+
+out_flush_buf:
+ usbtouch->buf_len = 0;
+ return;
+}
+#endif
+
+