/* * Generic packet handler. * Called by the HC (host controller). * * Returns length of the transaction or one of the USB_RET_XXX codes. */ int usb_generic_handle_packet(USBDevice *s, USBPacket *p) { switch(p->pid) { case USB_MSG_ATTACH: s->state = USB_STATE_ATTACHED; if (s->info->handle_attach) { s->info->handle_attach(s); } return 0; case USB_MSG_DETACH: s->state = USB_STATE_NOTATTACHED; return 0; case USB_MSG_RESET: s->remote_wakeup = 0; s->addr = 0; s->state = USB_STATE_DEFAULT; if (s->info->handle_reset) { s->info->handle_reset(s); } return 0; } /* Rest of the PIDs must match our address */ if (s->state < USB_STATE_DEFAULT || p->devaddr != s->addr) return USB_RET_NODEV; switch (p->pid) { case USB_TOKEN_SETUP: return do_token_setup(s, p); case USB_TOKEN_IN: return do_token_in(s, p); case USB_TOKEN_OUT: return do_token_out(s, p); default: return USB_RET_STALL; } }
static int usb_process_one(USBPacket *p) { USBDevice *dev = p->ep->dev; if (p->ep->nr == 0) { /* control pipe */ switch (p->pid) { case USB_TOKEN_SETUP: return do_token_setup(dev, p); case USB_TOKEN_IN: return do_token_in(dev, p); case USB_TOKEN_OUT: return do_token_out(dev, p); default: return USB_RET_STALL; } } else { /* data pipe */ return usb_device_handle_data(dev, p); } }