#ifdef MULTI_PACKET
static void usbtouch_process_multi(struct usbtouch_usb *usbtouch,
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, 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,
buf_len - pos);
/* unknown packet: skip one byte */
if (unlikely(!pkt_len)) {
pos++;
continue;
}
/* full packet: process */
if (likely((pkt_len > 0) && (pkt_len <= buf_len - pos))) {
usbtouch_process_pkt(usbtouch, 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
static void usbtouch_irq(struct urb *urb)
{
struct usbtouch_usb *usbtouch = urb->context;
int retval;