Exemplo n.º 1
0
static int eth_stop(struct net_device *net)
{
	struct eth_dev	*dev = netdev_priv(net);
	unsigned long	flags;

	VDBG(dev, "%s\n", __func__);
	netif_stop_queue(net);

	DBG(dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld\n",
		dev->net->stats.rx_packets, dev->net->stats.tx_packets,
		dev->net->stats.rx_errors, dev->net->stats.tx_errors
		);

	/* ensure there are no more active requests */
	spin_lock_irqsave(&dev->lock, flags);
	if (dev->port_usb) {
		struct gether	*link = dev->port_usb;

		if (link->close)
			link->close(link);

		/* NOTE:  we have no abort-queue primitive we could use
		 * to cancel all pending I/O.  Instead, we disable then
		 * reenable the endpoints ... this idiom may leave toggle
		 * wrong, but that's a self-correcting error.
		 *
		 * REVISIT:  we *COULD* just let the transfers complete at
		 * their own pace; the network stack can handle old packets.
		 * For the moment we leave this here, since it works.
		 */
		usb_ep_disable(link->in_ep);
		usb_ep_disable(link->out_ep);
		if (netif_carrier_ok(net)) {
			DBG(dev, "host still using in/out endpoints\n");
			usb_ep_enable(link->in_ep, link->in);
			usb_ep_enable(link->out_ep, link->out);
		}
	}
	spin_unlock_irqrestore(&dev->lock, flags);

	return 0;
}
Exemplo n.º 2
0
void
MulticastTransport::passive_connection(MulticastPeer local_peer, MulticastPeer remote_peer)
{
  GuardThreadType guard(this->connections_lock_);

  VDBG_LVL((LM_DEBUG, "(%P|%t) MulticastTransport[%C]::passive_connection "
            "from remote peer 0x%x to local peer 0x%x\n",
            this->config_i_->name().c_str(), remote_peer, local_peer), 2);

  const Peers peers(remote_peer, local_peer);
  const PendConnMap::iterator pend = this->pending_connections_.find(peers);

  if (pend != pending_connections_.end()) {

    Links::const_iterator server_link = this->server_links_.find(local_peer);
    DataLink_rch link;

    if (server_link != this->server_links_.end()) {
      link = static_rchandle_cast<DataLink>(server_link->second);
    }

    VDBG((LM_DEBUG, "(%P|%t) MulticastTransport::passive_connection completing\n"));
    PendConnMap::iterator updated_pend = pend;

    do {
      TransportClient* pend_client = updated_pend->second.front().first;
      RepoId remote_repo = updated_pend->second.front().second;

      guard.release();
      pend_client->use_datalink(remote_repo, link);

      guard.acquire();

    } while ((updated_pend = pending_connections_.find(peers)) != pending_connections_.end());
  }

  //if connection was pending, calls to use_datalink finalized the connection
  //if it was not previously pending, accept_datalink() will finalize connection
  this->connections_.insert(peers);
}
Exemplo n.º 3
0
/* Resets endpoint */
static void ep_init(struct udc_regs __iomem *regs, struct udc_ep *ep)
{
	u32		tmp;

	VDBG(ep->dev, "ep-%d reset\n", ep->num);
	ep->ep.desc = NULL;
	ep->ep.ops = &udc_ep_ops;
	INIT_LIST_HEAD(&ep->queue);

	ep->ep.maxpacket = (u16) ~0;
	/* set NAK */
	tmp = readl(&ep->regs->ctl);
	tmp |= AMD_BIT(UDC_EPCTL_SNAK);
	writel(tmp, &ep->regs->ctl);
	ep->naking = 1;

	/* disable interrupt */
	tmp = readl(&regs->ep_irqmsk);
	tmp |= AMD_BIT(ep->num);
	writel(tmp, &regs->ep_irqmsk);

	if (ep->in) {
		/* unset P and IN bit of potential former DMA */
		tmp = readl(&ep->regs->ctl);
		tmp &= AMD_UNMASK_BIT(UDC_EPCTL_P);
		writel(tmp, &ep->regs->ctl);

		tmp = readl(&ep->regs->sts);
		tmp |= AMD_BIT(UDC_EPSTS_IN);
		writel(tmp, &ep->regs->sts);

		/* flush the fifo */
		tmp = readl(&ep->regs->ctl);
		tmp |= AMD_BIT(UDC_EPCTL_F);
		writel(tmp, &ep->regs->ctl);

	}
	/* reset desc pointer */
	writel(0, &ep->regs->desptr);
}
Exemplo n.º 4
0
static int goku_ep_disable(struct usb_ep *_ep)
{
	struct goku_ep	*ep;
	struct goku_udc	*dev;
	unsigned long	flags;

	ep = container_of(_ep, struct goku_ep, ep);
	if (!_ep || !ep->ep.desc)
		return -ENODEV;
	dev = ep->dev;
	if (dev->ep0state == EP0_SUSPEND)
		return -EBUSY;

	VDBG(dev, "disable %s\n", _ep->name);

	spin_lock_irqsave(&dev->lock, flags);
	nuke(ep, -ESHUTDOWN);
	ep_reset(dev->regs, ep);
	spin_unlock_irqrestore(&dev->lock, flags);

	return 0;
}
Exemplo n.º 5
0
int proc_status_read(char *buffer, char **start, off_t offset, int count,
    int *eof, void *user_data)
{
  struct psfreedom_device *dev = user_data;
  unsigned int len;
  unsigned long flags;

  spin_lock_irqsave (&dev->lock, flags);

  /* This file is meant to be read in a loop, so don't spam dmesg with an INFO
     message when it gets read */
  VDBG (dev, "proc_status_read (/proc/%s/%s) called. count %d\n",
      PROC_DIR_NAME, PROC_STATUS_NAME, count);

  *eof = 1;
  /* fill the buffer, return the buffer size */
  len = sprintf (buffer + offset, "%s\n", STATUS_STR (dev->status));

  spin_unlock_irqrestore (&dev->lock, flags);

  return len;
}
Exemplo n.º 6
0
static int audioservice_send(struct bluetooth_data *data,
		const bt_audio_msg_header_t *msg)
{
	int err;
	uint16_t length;

	length = msg->length ? msg->length : BT_SUGGESTED_BUFFER_SIZE;

	VDBG("sending %s", bt_audio_strtype(msg->type));
	if (send(data->server.fd, msg, length,
			MSG_NOSIGNAL) > 0)
		err = 0;
	else {
		err = -errno;
		ERR("Error sending data to audio service: %s(%d)",
			strerror(errno), errno);
		if (err == -EPIPE)
			bluetooth_close(data);
	}

	return err;
}
Exemplo n.º 7
0
void calibrate_bitpool( struct bluetooth_data *data, int increase)
{
	VDBG(" Bitpool Calibrationg  bitpool  %d",data->sbc.bitpool);
	VDBG(" Bitpool Calibrationg freq %d",data->sbc.frequency);
	VDBG(" Bitpool Calibrationg mode %d",data->sbc.mode);
	VDBG(" Bitpool Calibrationg max_bitpool %d",data->sbc_capabilities.max_bitpool);
	VDBG(" Bitpool Calibrationg min_bitpool %d",data->sbc_capabilities.min_bitpool);
	VDBG(" origin bitpool %d",data->bitpool);
//	VDBG(" Bitpool Calibrationg to %d",data->sbc.bitpool);
//	VDBG(" Bitpool Calibrationg to %d",data->sbc.bitpool);

if( increase ){
	data->sbc.bitpool=data->sbc_capabilities.max_bitpool;
	DBG(" Bitpool increased to %d",data->sbc.bitpool);
} else { // if we are decreasing bitpool, using middle quality values
	if( data->sbc.bitpool != data->sbc_capabilities.max_bitpool ) return;
	skip_avdtp_flow_check=1;
	if(data->sbc_capabilities.max_bitpool <= 35 ){
	if ((data->sbc.mode == SBC_MODE_JOINT_STEREO) ||
		(data->sbc.mode == SBC_MODE_STEREO )){
		switch( data->sbc.frequency ){
			case BT_SBC_SAMPLING_FREQ_44100:
				data->sbc.bitpool = MAX(19,data->sbc_capabilities.min_bitpool);
				break;
			case BT_SBC_SAMPLING_FREQ_48000:
				data->sbc.bitpool = MAX(18, data->sbc_capabilities.min_bitpool);
				break;
		}
	} else { // for other modes
		switch ( data->sbc.frequency) {
			case BT_SBC_SAMPLING_FREQ_44100:
				data->sbc.bitpool = MAX(19,data->sbc_capabilities.min_bitpool);
				break;
			case BT_SBC_SAMPLING_FREQ_48000:
				data->sbc.bitpool = MAX(18, data->sbc_capabilities.min_bitpool);
				break;
		}
	}
	}else{
	data->sbc.bitpool=data->sbc_capabilities.max_bitpool-20;
	}
	DBG(" Bitpool decreased to %d",data->sbc.bitpool);

}

}
Exemplo n.º 8
0
void
MulticastTransport::stop_accepting_or_connecting(TransportClient* client,
                                                 const RepoId& remote_id)
{
  VDBG((LM_DEBUG, "(%P|%t) MulticastTransport::stop_accepting_or_connecting\n"));

  GuardThreadType guard(this->connections_lock_);

  for (PendConnMap::iterator it = this->pending_connections_.begin();
       it != this->pending_connections_.end(); ++it) {
    for (size_t i = 0; i < it->second.size(); ++i) {
      if (it->second[i].first == client && it->second[i].second == remote_id) {
        it->second.erase(it->second.begin() + i);
        break;
      }
    }

    if (it->second.empty()) {
      this->pending_connections_.erase(it);
      return;
    }
  }
}
/**
 * Run a script. argv[2] is already NULL.
 */
static int run(char *argv[3], struct in_addr *ip)
{
	int status;
	char *addr = addr; /* for gcc */
	const char *fmt = "%s %s %s" + 3;

	VDBG("%s run %s %s\n", intf, argv[0], argv[1]);

	if (ip) {
		addr = inet_ntoa(*ip);
		setenv("ip", addr, 1);
		fmt -= 3;
	}
	bb_info_msg(fmt, argv[1], intf, addr);

	status = wait4pid(spawn(argv));
	if (status < 0) {
		bb_perror_msg("%s %s %s" + 3, argv[1], intf);
		return -errno;
	}
	if (status != 0)
		bb_error_msg("script %s %s failed, exitcode=%d", argv[0], argv[1], status);
	return status;
}
Exemplo n.º 10
0
static void tx_complete(struct usb_ep *ep, struct usb_request *req)
{
	struct printer_dev	*dev = ep->driver_data;

	switch (req->status) {
	default:
		VDBG(dev, "tx err %d\n", req->status);
		
	case -ECONNRESET:		
	case -ESHUTDOWN:		
		break;
	case 0:
		break;
	}

	spin_lock(&dev->lock);
	list_del_init(&req->list);
	list_add(&req->list, &dev->tx_reqs);
	wake_up_interruptible(&dev->tx_wait);
	if (likely(list_empty(&dev->tx_reqs_active)))
		wake_up_interruptible(&dev->tx_flush_wait);

	spin_unlock(&dev->lock);
}
Exemplo n.º 11
0
/* Called when entering a state */
int otg_set_state(struct otg_fsm *fsm, enum usb_otg_state new_state)
{
	state_changed = 1;
	if (fsm->transceiver->state == new_state)
		return 0;

	VDBG("chg state to %s", state_string(new_state));

	otg_leave_state(fsm, fsm->transceiver->state);

	switch (new_state) {
	case OTG_STATE_B_IDLE:
		otg_drv_vbus(fsm, 0);
		otg_chrg_vbus(fsm, 0);
		otg_loc_conn(fsm, 0);
		otg_loc_sof(fsm, 0);
		otg_set_protocol(fsm, PROTO_UNDEF);
		otg_add_timer(fsm, b_se0_srp_tmr);
		break;
	case OTG_STATE_B_SRP_INIT:
		otg_start_pulse(fsm);
		otg_loc_sof(fsm, 0);
		otg_set_protocol(fsm, PROTO_UNDEF);
		otg_add_timer(fsm, b_srp_fail_tmr);
		break;
	case OTG_STATE_B_PERIPHERAL:
		otg_chrg_vbus(fsm, 0);
		otg_loc_conn(fsm, 1);
		otg_loc_sof(fsm, 0);
		otg_set_protocol(fsm, PROTO_GADGET);
		break;
	case OTG_STATE_B_WAIT_ACON:
		otg_chrg_vbus(fsm, 0);
		otg_loc_conn(fsm, 0);
		otg_loc_sof(fsm, 0);
		otg_set_protocol(fsm, PROTO_HOST);
		otg_add_timer(fsm, b_ase0_brst_tmr);
		fsm->a_bus_suspend = 0;
		break;
	case OTG_STATE_B_HOST:
		otg_chrg_vbus(fsm, 0);
		otg_loc_conn(fsm, 0);
		otg_loc_sof(fsm, 1);
		otg_set_protocol(fsm, PROTO_HOST);
		usb_bus_start_enum(fsm->transceiver->host,
				   fsm->transceiver->host->otg_port);
		break;
	case OTG_STATE_A_IDLE:
		otg_drv_vbus(fsm, 0);
		otg_chrg_vbus(fsm, 0);
		otg_loc_conn(fsm, 0);
		otg_loc_sof(fsm, 0);
		otg_set_protocol(fsm, PROTO_HOST);
		break;
	case OTG_STATE_A_WAIT_VRISE:
		otg_drv_vbus(fsm, 1);
		otg_loc_conn(fsm, 0);
		otg_loc_sof(fsm, 0);
		otg_set_protocol(fsm, PROTO_HOST);
		otg_add_timer(fsm, a_wait_vrise_tmr);
		break;
	case OTG_STATE_A_WAIT_BCON:
		otg_drv_vbus(fsm, 1);
		otg_loc_conn(fsm, 0);
		otg_loc_sof(fsm, 0);
		otg_set_protocol(fsm, PROTO_HOST);
		otg_add_timer(fsm, a_wait_bcon_tmr);
		break;
	case OTG_STATE_A_HOST:
		otg_drv_vbus(fsm, 1);
		otg_loc_conn(fsm, 0);
		otg_loc_sof(fsm, 1);
		otg_set_protocol(fsm, PROTO_HOST);
		/* When HNP is triggered while a_bus_req = 0, a_host will 
		 * suspend too fast to complete a_set_b_hnp_en
		 */
		if (!fsm->a_bus_req || fsm->a_suspend_req)
			otg_add_timer(fsm, a_wait_enum_tmr);
		break;
	case OTG_STATE_A_SUSPEND:
		otg_drv_vbus(fsm, 1);
		otg_loc_conn(fsm, 0);
		otg_loc_sof(fsm, 0);
		otg_set_protocol(fsm, PROTO_HOST);
		otg_add_timer(fsm, a_aidl_bdis_tmr);

		break;
	case OTG_STATE_A_PERIPHERAL:
		otg_loc_conn(fsm, 1);
		otg_loc_sof(fsm, 0);
		otg_set_protocol(fsm, PROTO_GADGET);
		otg_drv_vbus(fsm, 1);
		break;
	case OTG_STATE_A_WAIT_VFALL:
		otg_drv_vbus(fsm, 0);
		otg_loc_conn(fsm, 0);
		otg_loc_sof(fsm, 0);
		otg_set_protocol(fsm, PROTO_HOST);
		break;
	case OTG_STATE_A_VBUS_ERR:
		otg_drv_vbus(fsm, 0);
		otg_loc_conn(fsm, 0);
		otg_loc_sof(fsm, 0);
		otg_set_protocol(fsm, PROTO_UNDEF);
		break;
	default:
		break;
	}

	fsm->transceiver->state = new_state;
	return 0;
}
Exemplo n.º 12
0
static int __init devices_bind(struct usb_gadget *gadget,
    struct psfreedom_device *dev)
{
  struct usb_ep *out_ep;
  struct usb_ep *in_ep;

  gadget_for_each_ep (out_ep, gadget) {
    if (0 == strcmp (out_ep->name,
            psfreedom_get_endpoint_name (&jig_out_endpoint_desc)))
      break;
  }
  if (!out_ep) {
    ERROR (dev, "%s: can't find %s on %s\n",
        psfreedom_get_endpoint_name (&jig_out_endpoint_desc),
        shortname, gadget->name);
    return -ENODEV;
  }
  out_ep->driver_data = out_ep;	/* claim */

  gadget_for_each_ep (in_ep, gadget) {
    if (0 == strcmp (in_ep->name,
            psfreedom_get_endpoint_name (&jig_in_endpoint_desc)))
      break;
  }
  if (!in_ep) {
    ERROR (dev, "%s: can't find %s on %s\n",
        psfreedom_get_endpoint_name (&jig_in_endpoint_desc),
        shortname, gadget->name);
    return -ENODEV;
  }
  in_ep->driver_data = in_ep;	/* claim */

  /* ok, we made sense of the hardware ... */
  dev->in_ep = in_ep;
  dev->out_ep = out_ep;

  /* If the machine specific code changed our descriptors,
     change the ones we'll send too */
  memcpy (port5_config_desc + USB_DT_CONFIG_SIZE + USB_DT_INTERFACE_SIZE,
      &jig_out_endpoint_desc,
      USB_DT_ENDPOINT_SIZE);
  memcpy (port5_config_desc + USB_DT_CONFIG_SIZE + \
      USB_DT_INTERFACE_SIZE + USB_DT_ENDPOINT_SIZE,
      &jig_in_endpoint_desc,
      USB_DT_ENDPOINT_SIZE);


  INFO(dev, "using %s, EP IN %s (0x%X)\n", gadget->name, in_ep->name,
      jig_in_endpoint_desc.bEndpointAddress);
  INFO(dev, "using %s, EP OUT %s (0x%X)\n", gadget->name, out_ep->name,
      jig_out_endpoint_desc.bEndpointAddress);

  /* the max packet size of all the devices must be the same as the ep0 max
     packet size, otherwise it won't work */
  ((struct usb_device_descriptor *)port1_device_desc)->bMaxPacketSize0 = \
      ((struct usb_device_descriptor *)port2_device_desc)->bMaxPacketSize0 = \
      ((struct usb_device_descriptor *)port3_device_desc)->bMaxPacketSize0 = \
      ((struct usb_device_descriptor *)port4_device_desc)->bMaxPacketSize0 = \
      ((struct usb_device_descriptor *)port5_device_desc)->bMaxPacketSize0 = \
      ((struct usb_device_descriptor *)port6_device_desc)->bMaxPacketSize0 = \
      gadget->ep0->maxpacket;
  VDBG(dev, "devices_bind finished ok\n");

  return 0;
}
Exemplo n.º 13
0
static void tx_complete(struct usb_ep *ep, struct usb_request *req)
{
	struct sk_buff	*skb = req->context;
	struct eth_dev	*dev = ep->driver_data;
	struct net_device *net = dev->net;
	struct usb_request *new_req;
	struct usb_ep *in;
	int length;
	int retval;

	switch (req->status) {
	default:
		dev->net->stats.tx_errors++;
		VDBG(dev, "tx err %d\n", req->status);
		/* FALLTHROUGH */
	case -ECONNRESET:		/* unlink */
	case -ESHUTDOWN:		/* disconnect etc */
		break;
	case 0:
		if (!req->zero)
			dev->net->stats.tx_bytes += req->length-1;
		else
			dev->net->stats.tx_bytes += req->length;
	}
	dev->net->stats.tx_packets++;

	spin_lock(&dev->req_lock);
	list_add_tail(&req->list, &dev->tx_reqs);

	if (dev->port_usb->multi_pkt_xfer) {
		dev->no_tx_req_used--;
		req->length = 0;
		in = dev->port_usb->in_ep;

		if (!list_empty(&dev->tx_reqs)) {
			new_req = container_of(dev->tx_reqs.next,
					struct usb_request, list);
			list_del(&new_req->list);
			spin_unlock(&dev->req_lock);
			if (new_req->length > 0) {
				length = new_req->length;

				/* NCM requires no zlp if transfer is
				 * dwNtbInMaxSize */
				if (dev->port_usb->is_fixed &&
					length == dev->port_usb->fixed_in_len &&
					(length % in->maxpacket) == 0)
					new_req->zero = 0;
				else
					new_req->zero = 1;

				/* use zlp framing on tx for strict CDC-Ether
				 * conformance, though any robust network rx
				 * path ignores extra padding. and some hardware
				 * doesn't like to write zlps.
				 */
				if (new_req->zero && !dev->zlp &&
						(length % in->maxpacket) == 0) {
					new_req->zero = 0;
					length++;
				}

				new_req->length = length;
				retval = usb_ep_queue(in, new_req, GFP_ATOMIC);
				switch (retval) {
				default:
					DBG(dev, "tx queue err %d\n", retval);
					break;
				case 0:
					spin_lock(&dev->req_lock);
					dev->no_tx_req_used++;
					spin_unlock(&dev->req_lock);
					net->trans_start = jiffies;
				}
			} else {
				spin_lock(&dev->req_lock);
				list_add(&new_req->list, &dev->tx_reqs);
				spin_unlock(&dev->req_lock);
			}
		} else {
Exemplo n.º 14
0
Arquivo: zcip.c Projeto: sdg7/wl500g
int zcip_main(int argc UNUSED_PARAM, char **argv)
{
	int state;
	char *r_opt;
	unsigned opts;

	// ugly trick, but I want these zeroed in one go
	struct {
		const struct in_addr null_ip;
		const struct ether_addr null_addr;
		struct in_addr ip;
		struct ifreq ifr;
		int timeout_ms; /* must be signed */
		unsigned conflicts;
		unsigned nprobes;
		unsigned nclaims;
		int ready;
	} L;
#define null_ip    (L.null_ip   )
#define null_addr  (L.null_addr )
#define ip         (L.ip        )
#define ifr        (L.ifr       )
#define timeout_ms (L.timeout_ms)
#define conflicts  (L.conflicts )
#define nprobes    (L.nprobes   )
#define nclaims    (L.nclaims   )
#define ready      (L.ready     )

	memset(&L, 0, sizeof(L));
	INIT_G();

#define FOREGROUND (opts & 1)
#define QUIT       (opts & 2)
	// parse commandline: prog [options] ifname script
	// exactly 2 args; -v accumulates and implies -f
	opt_complementary = "=2:vv:vf";
	opts = getopt32(argv, "fqr:p:v", &r_opt, &pidfile, &verbose);
#if !BB_MMU
	// on NOMMU reexec early (or else we will rerun things twice)
	if (!FOREGROUND)
		bb_daemonize_or_rexec(0 /*was: DAEMON_CHDIR_ROOT*/, argv);
#endif
	// open an ARP socket
	// (need to do it before openlog to prevent openlog from taking
	// fd 3 (sock_fd==3))
	xmove_fd(xsocket(AF_PACKET, SOCK_PACKET, htons(ETH_P_ARP)), sock_fd);
	if (!FOREGROUND) {
		// do it before all bb_xx_msg calls
		openlog(applet_name, 0, LOG_DAEMON);
		logmode |= LOGMODE_SYSLOG;
	}
	if (opts & 4) { // -r n.n.n.n
		if (inet_aton(r_opt, &ip) == 0
		 || (ntohl(ip.s_addr) & IN_CLASSB_NET) != LINKLOCAL_ADDR
		) {
			bb_error_msg_and_die("invalid link address");
		}
	}
	argv += optind - 1;

	/* Now: argv[0]:junk argv[1]:intf argv[2]:script argv[3]:NULL */
	/* We need to make space for script argument: */
	argv[0] = argv[1];
	argv[1] = argv[2];
	/* Now: argv[0]:intf argv[1]:script argv[2]:junk argv[3]:NULL */
#define argv_intf (argv[0])

	xsetenv("interface", argv_intf);

	// initialize the interface (modprobe, ifup, etc)
	if (run(argv, "init", NULL))
		return EXIT_FAILURE;

	// initialize saddr
	// saddr is: { u16 sa_family; u8 sa_data[14]; }
	//memset(&saddr, 0, sizeof(saddr));
	//TODO: are we leaving sa_family == 0 (AF_UNSPEC)?!
	safe_strncpy(saddr.sa_data, argv_intf, sizeof(saddr.sa_data));

	// bind to the interface's ARP socket
	xbind(sock_fd, &saddr, sizeof(saddr));

	// get the interface's ethernet address
	//memset(&ifr, 0, sizeof(ifr));
	strncpy_IFNAMSIZ(ifr.ifr_name, argv_intf);
	xioctl(sock_fd, SIOCGIFHWADDR, &ifr);
	memcpy(&eth_addr, &ifr.ifr_hwaddr.sa_data, ETH_ALEN);

	// start with some stable ip address, either a function of
	// the hardware address or else the last address we used.
	// we are taking low-order four bytes, as top-order ones
	// aren't random enough.
	// NOTE: the sequence of addresses we try changes only
	// depending on when we detect conflicts.
	{
		uint32_t t;
		move_from_unaligned32(t, ((char *)&eth_addr + 2));
		srand(t);
	}
	if (ip.s_addr == 0)
		ip.s_addr = pick();

	// FIXME cases to handle:
	//  - zcip already running!
	//  - link already has local address... just defend/update

	// daemonize now; don't delay system startup
	if (!FOREGROUND) {
#if BB_MMU
		bb_daemonize(0 /*was: DAEMON_CHDIR_ROOT*/);
#endif
		if (verbose)
			bb_info_msg("start, interface %s", argv_intf);
	}

	write_pidfile(pidfile);
	bb_signals(BB_FATAL_SIGS, cleanup);

	// run the dynamic address negotiation protocol,
	// restarting after address conflicts:
	//  - start with some address we want to try
	//  - short random delay
	//  - arp probes to see if another host uses it
	//  - arp announcements that we're claiming it
	//  - use it
	//  - defend it, within limits
	// exit if:
	// - address is successfully obtained and -q was given:
	//   run "<script> config", then exit with exitcode 0
	// - poll error (when does this happen?)
	// - read error (when does this happen?)
	// - sendto error (in arp()) (when does this happen?)
	// - revents & POLLERR (link down). run "<script> deconfig" first
	state = PROBE;
	while (1) {
		struct pollfd fds[1];
		unsigned deadline_us;
		struct arp_packet p;
		int source_ip_conflict;
		int target_ip_conflict;

		fds[0].fd = sock_fd;
		fds[0].events = POLLIN;
		fds[0].revents = 0;

		// poll, being ready to adjust current timeout
		if (!timeout_ms) {
			timeout_ms = random_delay_ms(PROBE_WAIT);
			// FIXME setsockopt(sock_fd, SO_ATTACH_FILTER, ...) to
			// make the kernel filter out all packets except
			// ones we'd care about.
		}
		// set deadline_us to the point in time when we timeout
		deadline_us = MONOTONIC_US() + timeout_ms * 1000;

		VDBG("...wait %d %s nprobes=%u, nclaims=%u\n",
				timeout_ms, argv_intf, nprobes, nclaims);

		switch (safe_poll(fds, 1, timeout_ms)) {

		default:
			//bb_perror_msg("poll"); - done in safe_poll
			cleanup(EXIT_FAILURE);

		// timeout
		case 0:
			VDBG("state = %d\n", state);
			switch (state) {
			case PROBE:
				// timeouts in the PROBE state mean no conflicting ARP packets
				// have been received, so we can progress through the states
				if (nprobes < PROBE_NUM) {
					nprobes++;
					VDBG("probe/%u %s@%s\n",
							nprobes, argv_intf, inet_ntoa(ip));
					arp(/* ARPOP_REQUEST, */
							/* &eth_addr, */ null_ip,
							&null_addr, ip);
					timeout_ms = PROBE_MIN * 1000;
					timeout_ms += random_delay_ms(PROBE_MAX - PROBE_MIN);
				}
				else {
					// Switch to announce state.
					state = ANNOUNCE;
					nclaims = 0;
					VDBG("announce/%u %s@%s\n",
							nclaims, argv_intf, inet_ntoa(ip));
					arp(/* ARPOP_REQUEST, */
							/* &eth_addr, */ ip,
							&eth_addr, ip);
					timeout_ms = ANNOUNCE_INTERVAL * 1000;
				}
				break;
			case RATE_LIMIT_PROBE:
				// timeouts in the RATE_LIMIT_PROBE state mean no conflicting ARP packets
				// have been received, so we can move immediately to the announce state
				state = ANNOUNCE;
				nclaims = 0;
				VDBG("announce/%u %s@%s\n",
						nclaims, argv_intf, inet_ntoa(ip));
				arp(/* ARPOP_REQUEST, */
						/* &eth_addr, */ ip,
						&eth_addr, ip);
				timeout_ms = ANNOUNCE_INTERVAL * 1000;
				break;
			case ANNOUNCE:
				// timeouts in the ANNOUNCE state mean no conflicting ARP packets
				// have been received, so we can progress through the states
				if (nclaims < ANNOUNCE_NUM) {
					nclaims++;
					VDBG("announce/%u %s@%s\n",
							nclaims, argv_intf, inet_ntoa(ip));
					arp(/* ARPOP_REQUEST, */
							/* &eth_addr, */ ip,
							&eth_addr, ip);
					timeout_ms = ANNOUNCE_INTERVAL * 1000;
				}
				else {
					// Switch to monitor state.
					state = MONITOR;
					// link is ok to use earlier
					// FIXME update filters
					run(argv, "config", &ip);
					ready = 1;
					conflicts = 0;
					timeout_ms = -1; // Never timeout in the monitor state.

					// NOTE: all other exit paths
					// should deconfig ...
					if (QUIT)
						cleanup(EXIT_SUCCESS);
				}
				break;
			case DEFEND:
				// We won!  No ARP replies, so just go back to monitor.
				state = MONITOR;
				timeout_ms = -1;
				conflicts = 0;
				break;
			default:
				// Invalid, should never happen.  Restart the whole protocol.
				state = PROBE;
				ip.s_addr = pick();
				timeout_ms = 0;
				nprobes = 0;
				nclaims = 0;
				break;
			} // switch (state)
			break; // case 0 (timeout)

		// packets arriving, or link went down
		case 1:
			// We need to adjust the timeout in case we didn't receive
			// a conflicting packet.
			if (timeout_ms > 0) {
				unsigned diff = deadline_us - MONOTONIC_US();
				if ((int)(diff) < 0) {
					// Current time is greater than the expected timeout time.
					// Should never happen.
					VDBG("missed an expected timeout\n");
					timeout_ms = 0;
				} else {
					VDBG("adjusting timeout\n");
					timeout_ms = (diff / 1000) | 1; /* never 0 */
				}
			}

			if ((fds[0].revents & POLLIN) == 0) {
				if (fds[0].revents & POLLERR) {
					// FIXME: links routinely go down;
					// this shouldn't necessarily exit.
					bb_error_msg("iface %s is down", argv_intf);
					if (ready) {
						run(argv, "deconfig", &ip);
					}
					cleanup(EXIT_FAILURE);
				}
				continue;
			}

			// read ARP packet
			if (safe_read(sock_fd, &p, sizeof(p)) < 0) {
				bb_perror_msg(bb_msg_read_error);
				cleanup(EXIT_FAILURE);
			}
			if (p.eth.ether_type != htons(ETHERTYPE_ARP))
				continue;
#ifdef DEBUG
			{
				struct ether_addr *sha = (struct ether_addr *) p.arp.arp_sha;
				struct ether_addr *tha = (struct ether_addr *) p.arp.arp_tha;
				struct in_addr *spa = (struct in_addr *) p.arp.arp_spa;
				struct in_addr *tpa = (struct in_addr *) p.arp.arp_tpa;
				VDBG("%s recv arp type=%d, op=%d,\n",
					argv_intf, ntohs(p.eth.ether_type),
					ntohs(p.arp.arp_op));
				VDBG("\tsource=%s %s\n",
					ether_ntoa(sha),
					inet_ntoa(*spa));
				VDBG("\ttarget=%s %s\n",
					ether_ntoa(tha),
					inet_ntoa(*tpa));
			}
#endif
			if (p.arp.arp_op != htons(ARPOP_REQUEST)
			 && p.arp.arp_op != htons(ARPOP_REPLY))
				continue;

			source_ip_conflict = 0;
			target_ip_conflict = 0;

			if (memcmp(p.arp.arp_spa, &ip.s_addr, sizeof(struct in_addr)) == 0
			 && memcmp(&p.arp.arp_sha, &eth_addr, ETH_ALEN) != 0
			) {
				source_ip_conflict = 1;
			}
			if (p.arp.arp_op == htons(ARPOP_REQUEST)
			 && memcmp(p.arp.arp_tpa, &ip.s_addr, sizeof(struct in_addr)) == 0
			 && memcmp(&p.arp.arp_tha, &eth_addr, ETH_ALEN) != 0
			) {
				target_ip_conflict = 1;
			}

			VDBG("state = %d, source ip conflict = %d, target ip conflict = %d\n",
				state, source_ip_conflict, target_ip_conflict);
			switch (state) {
			case PROBE:
			case ANNOUNCE:
				// When probing or announcing, check for source IP conflicts
				// and other hosts doing ARP probes (target IP conflicts).
				if (source_ip_conflict || target_ip_conflict) {
					conflicts++;
					if (conflicts >= MAX_CONFLICTS) {
						VDBG("%s ratelimit\n", argv_intf);
						timeout_ms = RATE_LIMIT_INTERVAL * 1000;
						state = RATE_LIMIT_PROBE;
					}

					// restart the whole protocol
					ip.s_addr = pick();
					timeout_ms = 0;
					nprobes = 0;
					nclaims = 0;
				}
				break;
			case MONITOR:
				// If a conflict, we try to defend with a single ARP probe.
				if (source_ip_conflict) {
					VDBG("monitor conflict -- defending\n");
					state = DEFEND;
					timeout_ms = DEFEND_INTERVAL * 1000;
					arp(/* ARPOP_REQUEST, */
						/* &eth_addr, */ ip,
						&eth_addr, ip);
				}
				break;
			case DEFEND:
				// Well, we tried.  Start over (on conflict).
				if (source_ip_conflict) {
					state = PROBE;
					VDBG("defend conflict -- starting over\n");
					ready = 0;
					run(argv, "deconfig", &ip);

					// restart the whole protocol
					ip.s_addr = pick();
					timeout_ms = 0;
					nprobes = 0;
					nclaims = 0;
				}
				break;
			default:
				// Invalid, should never happen.  Restart the whole protocol.
				VDBG("invalid state -- starting over\n");
				state = PROBE;
				ip.s_addr = pick();
				timeout_ms = 0;
				nprobes = 0;
				nclaims = 0;
				break;
			} // switch state
			break; // case 1 (packets arriving)
		} // switch poll
	} // while (1)
#undef argv_intf
}
Exemplo n.º 15
0
static int avdtp_write(struct bluetooth_data *data)
{
	int ret = 0;
	struct rtp_header *header;
	struct rtp_payload *payload;
	uint64_t now;
	long duration = data->frame_duration * data->frame_count;
#ifdef ENABLE_TIMING
	uint64_t begin, end, begin2, end2;
	begin = get_microseconds();
#endif

	header = (struct rtp_header *)data->buffer;
	payload = (struct rtp_payload *)(data->buffer + sizeof(*header));

	memset(data->buffer, 0, sizeof(*header) + sizeof(*payload));

	payload->frame_count = data->frame_count;
	header->v = 2;
	header->pt = 1;
	header->sequence_number = htons(data->seq_num);
	header->timestamp = htonl(data->nsamples);
	header->ssrc = htonl(1);

	data->stream.revents = 0;
#ifdef ENABLE_TIMING
	begin2 = get_microseconds();
#endif
	ret = poll(&data->stream, 1, POLL_TIMEOUT);
#ifdef ENABLE_TIMING
	end2 = get_microseconds();
	print_time("poll Time Taken", begin2, end2);
#endif
	if (ret == 1 && data->stream.revents == POLLOUT) {
		long ahead = 0;
		now = get_microseconds();

		if (data->next_write) {
			ahead = data->next_write - now;
#ifdef ENABLE_TIMING
			DBG("duration: %ld, ahead: %ld", duration, ahead);
#endif
			if (ahead > 0) {
				/* too fast, need to throttle */
				usleep(ahead);
			}
		} else {
			data->next_write = now;
		}

         //DBG("duration: %ld, ahead: %ld", duration, ahead);

	//DBG("decrease_bitpool %d",decrease_bitpool);
	if(ahead <= -30*1000){
		decrease_bitpool++;
		if(decrease_bitpool > 2 ) {
			DBG("duration: %ld, ahead: %ld", duration, ahead);
			VDBG("calibrating Bitpool Decrease");
			calibrate_bitpool(data,0);
			decrease_bitpool = 0;
			avdtp_good_counter=0; 
		}
	} else if(ahead >= 10000){
		if(data->sbc.bitpool != data->sbc_capabilities.max_bitpool){
		avdtp_good_counter++;	
		if(avdtp_good_counter > 1000){//about 10 secs
		DBG("duration: %ld, ahead: %ld avdtp_good_counter: %ld", duration, ahead, avdtp_good_counter);
		calibrate_bitpool(data,1);
                skip_avdtp_flow_check=0;
		}
		}
		decrease_bitpool = 0;
	
	}



		if (ahead <= -CATCH_UP_TIMEOUT * 1000) {
			/* fallen too far behind, don't try to catch up */
			DBG("ahead < %d, reseting next_write timestamp", -CATCH_UP_TIMEOUT * 1000);
			data->next_write = 0;
		} else {
			data->next_write += duration;
		}

#ifdef ENABLE_TIMING
		begin2 = get_microseconds();
#endif
		pthread_mutex_lock(&data->lock);
		if (data->stream.fd == -1) {
			pthread_mutex_unlock(&data->lock);
			return EBADF;
		} else {
			ret = send(data->stream.fd, data->buffer, data->count, MSG_NOSIGNAL);
		}
		pthread_mutex_unlock(&data->lock);
#ifdef ENABLE_TIMING
		end2 = get_microseconds();
		print_time("send", begin2, end2);
#endif
		if (ret < 0) {
			/* can happen during normal remote disconnect */
			VDBG("send() failed: %d (errno %s)", ret, strerror(errno));
		}
		if (ret == -EPIPE) {
			bluetooth_close(data);
		}
	} else {
		/* can happen during normal remote disconnect */
		VDBG("poll() failed: %d (revents = %d, errno %s)",
				ret, data->stream.revents, strerror(errno));
		data->next_write = 0;
	}

	/* Reset buffer of data to send */
	data->count = sizeof(struct rtp_header) + sizeof(struct rtp_payload);
	data->frame_count = 0;
	data->samples = 0;
	data->seq_num++;

#ifdef ENABLE_TIMING
	end = get_microseconds();
	print_time("avdtp_write", begin, end);
#endif
	return 0; /* always return success */
}
static void rx_complete(struct usb_ep *ep, struct usb_request *req)
{
	struct sk_buff	*skb = req->context;
	struct eth_dev	*dev = ep->driver_data;
	int		status = req->status;
	bool		queue = 0;

	switch (status) {

	/* normal completion */
	case 0:
		skb_put(skb, req->actual);

		if (dev->unwrap) {
			unsigned long	flags;

			spin_lock_irqsave(&dev->lock, flags);
			if (dev->port_usb) {
				status = dev->unwrap(dev->port_usb,
							skb,
							&dev->rx_frames);
				if (status == -EINVAL)
					dev->net->stats.rx_errors++;
				else if (status == -EOVERFLOW)
					dev->net->stats.rx_over_errors++;
			} else {
				dev_kfree_skb_any(skb);
				status = -ENOTCONN;
			}
			spin_unlock_irqrestore(&dev->lock, flags);
		} else {
			skb_queue_tail(&dev->rx_frames, skb);
		}

		if (!status)
			queue = 1;
		break;

	/* software-driven interface shutdown */
	case -ECONNRESET:		/* unlink */
	case -ESHUTDOWN:		/* disconnect etc */
		VDBG(dev, "rx shutdown, code %d\n", status);
		goto quiesce;

	/* for hardware automagic (such as pxa) */
	case -ECONNABORTED:		/* endpoint reset */
		DBG(dev, "rx %s reset\n", ep->name);
		defer_kevent(dev, WORK_RX_MEMORY);
quiesce:
		dev_kfree_skb_any(skb);
		goto clean;

	/* data overrun */
	case -EOVERFLOW:
		dev->net->stats.rx_over_errors++;
		/* FALLTHROUGH */

	default:
		queue = 1;
		dev_kfree_skb_any(skb);
		dev->net->stats.rx_errors++;
		DBG(dev, "rx status %d\n", status);
		break;
	}

clean:
	spin_lock(&dev->req_lock);
	list_add(&req->list, &dev->rx_reqs);
	spin_unlock(&dev->req_lock);

	if (queue)
		queue_work(uether_wq, &dev->rx_work);
}
Exemplo n.º 17
0
/* Called when entering a state */
static int otg_set_state(struct otg_fsm *fsm, enum usb_otg_state new_state)
{
	state_changed = 1;
	if (fsm->otg->phy->state == new_state)
		return 0;
	VDBG("Set state: %s\n", usb_otg_state_string(new_state));
	otg_leave_state(fsm, fsm->otg->phy->state);
	switch (new_state) {
	case OTG_STATE_B_IDLE:
		otg_drv_vbus(fsm, 0);
		otg_chrg_vbus(fsm, 0);
		otg_loc_conn(fsm, 0);
		otg_loc_sof(fsm, 0);
		/*
		 * Driver is responsible for starting ADP probing
		 * if ADP sensing times out.
		 */
		otg_start_adp_sns(fsm);
		otg_set_protocol(fsm, PROTO_UNDEF);
		otg_add_timer(fsm, B_SE0_SRP);
		break;
	case OTG_STATE_B_SRP_INIT:
		otg_start_pulse(fsm);
		otg_loc_sof(fsm, 0);
		otg_set_protocol(fsm, PROTO_UNDEF);
		otg_add_timer(fsm, B_SRP_FAIL);
		break;
	case OTG_STATE_B_PERIPHERAL:
		otg_chrg_vbus(fsm, 0);
		otg_loc_sof(fsm, 0);
		otg_set_protocol(fsm, PROTO_GADGET);
		otg_loc_conn(fsm, 1);
		break;
	case OTG_STATE_B_WAIT_ACON:
		otg_chrg_vbus(fsm, 0);
		otg_loc_conn(fsm, 0);
		otg_loc_sof(fsm, 0);
		otg_set_protocol(fsm, PROTO_HOST);
		otg_add_timer(fsm, B_ASE0_BRST);
		fsm->a_bus_suspend = 0;
		break;
	case OTG_STATE_B_HOST:
		otg_chrg_vbus(fsm, 0);
		otg_loc_conn(fsm, 0);
		otg_loc_sof(fsm, 1);
		otg_set_protocol(fsm, PROTO_HOST);
		usb_bus_start_enum(fsm->otg->host,
				fsm->otg->host->otg_port);
		break;
	case OTG_STATE_A_IDLE:
		otg_drv_vbus(fsm, 0);
		otg_chrg_vbus(fsm, 0);
		otg_loc_conn(fsm, 0);
		otg_loc_sof(fsm, 0);
		otg_start_adp_prb(fsm);
		otg_set_protocol(fsm, PROTO_HOST);
		break;
	case OTG_STATE_A_WAIT_VRISE:
		otg_drv_vbus(fsm, 1);
		otg_loc_conn(fsm, 0);
		otg_loc_sof(fsm, 0);
		otg_set_protocol(fsm, PROTO_HOST);
		otg_add_timer(fsm, A_WAIT_VRISE);
		break;
	case OTG_STATE_A_WAIT_BCON:
		otg_drv_vbus(fsm, 1);
		otg_loc_conn(fsm, 0);
		otg_loc_sof(fsm, 0);
		otg_set_protocol(fsm, PROTO_HOST);
		otg_add_timer(fsm, A_WAIT_BCON);
		break;
	case OTG_STATE_A_HOST:
		otg_drv_vbus(fsm, 1);
		otg_loc_conn(fsm, 0);
		otg_loc_sof(fsm, 1);
		otg_set_protocol(fsm, PROTO_HOST);
		/*
		 * When HNP is triggered while a_bus_req = 0, a_host will
		 * suspend too fast to complete a_set_b_hnp_en
		 */
		if (!fsm->a_bus_req || fsm->a_suspend_req_inf)
			otg_add_timer(fsm, A_WAIT_ENUM);
		break;
	case OTG_STATE_A_SUSPEND:
		otg_drv_vbus(fsm, 1);
		otg_loc_conn(fsm, 0);
		otg_loc_sof(fsm, 0);
		otg_set_protocol(fsm, PROTO_HOST);
		otg_add_timer(fsm, A_AIDL_BDIS);

		break;
	case OTG_STATE_A_PERIPHERAL:
		otg_loc_sof(fsm, 0);
		otg_set_protocol(fsm, PROTO_GADGET);
		otg_drv_vbus(fsm, 1);
		otg_loc_conn(fsm, 1);
		otg_add_timer(fsm, A_BIDL_ADIS);
		break;
	case OTG_STATE_A_WAIT_VFALL:
		otg_drv_vbus(fsm, 0);
		otg_loc_conn(fsm, 0);
		otg_loc_sof(fsm, 0);
		otg_set_protocol(fsm, PROTO_HOST);
		otg_add_timer(fsm, A_WAIT_VFALL);
		break;
	case OTG_STATE_A_VBUS_ERR:
		otg_drv_vbus(fsm, 0);
		otg_loc_conn(fsm, 0);
		otg_loc_sof(fsm, 0);
		otg_set_protocol(fsm, PROTO_UNDEF);
		break;
	default:
		break;
	}

	fsm->otg->phy->state = new_state;
	return 0;
}
Exemplo n.º 18
0
int a2dp_write(a2dpData d, const void* buffer, int count)
{
	struct bluetooth_data* data = (struct bluetooth_data*)d;
	uint8_t* src = (uint8_t *)buffer;
	int codesize;
	int err, ret = 0;
	long frames_left = count;
	int encoded;
	unsigned int written;
	const char *buff;
	int did_configure = 0;
#ifdef ENABLE_TIMING
	uint64_t begin, end;
	DBG("********** a2dp_write **********");
	begin = get_microseconds();
#endif

	err = wait_for_start(data, WRITE_TIMEOUT);
	if (err < 0)
		return err;

	codesize = data->codesize;

	while (frames_left >= codesize) {
		/* Enough data to encode (sbc wants 512 byte blocks) */
		encoded = sbc_encode(&(data->sbc), src, codesize,
					data->buffer + data->count,
					sizeof(data->buffer) - data->count,
					&written);
		if (encoded <= 0) {
			ERR("Encoding error %d", encoded);
			goto done;
		}
		VDBG("sbc_encode returned %d, codesize: %d, written: %d\n",
			encoded, codesize, written);

		src += encoded;
		data->count += written;
		data->frame_count++;
		data->samples += encoded;
		data->nsamples += encoded;

		/* No space left for another frame then send */
		if ((data->count + written >= data->link_mtu) ||
				(data->count + written >= BUFFER_SIZE)) {
			VDBG("sending packet %d, count %d, link_mtu %u",
					data->seq_num, data->count,
					data->link_mtu);
			err = avdtp_write(data);
			if (err < 0)
				return err;
		}

		ret += encoded;
		frames_left -= encoded;
	}

	if (frames_left > 0)
		ERR("%ld bytes left at end of a2dp_write\n", frames_left);

done:
#ifdef ENABLE_TIMING
	end = get_microseconds();
	print_time("a2dp_write total", begin, end);
#endif
	return ret;
}
Exemplo n.º 19
0
/* State change judgement */
int otg_statemachine(struct otg_fsm *fsm)
{
	enum usb_otg_state state;
	unsigned long flags;

	spin_lock_irqsave(&fsm->lock, flags);

	state = fsm->transceiver->state;
	state_changed = 0;
	/* State machine state change judgement */

	VDBG("top: curr state=%s", state_string(state));

	switch (state) {
	case OTG_STATE_UNDEFINED:
		VDBG("fsm->id = %d", fsm->id);
		if (fsm->id)
			otg_set_state(fsm, OTG_STATE_B_IDLE);
		else
			otg_set_state(fsm, OTG_STATE_A_IDLE);
		break;
	case OTG_STATE_B_IDLE:
		VDBG("gadget: %p", fsm->transceiver->gadget);
		if (!fsm->id)
			otg_set_state(fsm, OTG_STATE_A_IDLE);
		else if (fsm->b_sess_vld && fsm->transceiver->gadget)
			otg_set_state(fsm, OTG_STATE_B_PERIPHERAL);
		else if (fsm->b_bus_req && fsm->b_sess_end && fsm->b_se0_srp)
			otg_set_state(fsm, OTG_STATE_B_SRP_INIT);
		break;
	case OTG_STATE_B_SRP_INIT:
		if (!fsm->id || fsm->b_srp_done)
			otg_set_state(fsm, OTG_STATE_B_IDLE);
		break;
	case OTG_STATE_B_PERIPHERAL:
		if (!fsm->id || !fsm->b_sess_vld)
			otg_set_state(fsm, OTG_STATE_B_IDLE);
		else if (fsm->b_bus_req &&
			 fsm->transceiver->gadget->b_hnp_enable &&
			 fsm->a_bus_suspend)
			otg_set_state(fsm, OTG_STATE_B_WAIT_ACON);
		break;
	case OTG_STATE_B_WAIT_ACON:
		if (fsm->a_conn)
			otg_set_state(fsm, OTG_STATE_B_HOST);
		else if (!fsm->id || !fsm->b_sess_vld)
			otg_set_state(fsm, OTG_STATE_B_IDLE);
		else if (fsm->a_bus_resume || fsm->b_ase0_brst_tmout) {
			fsm->b_ase0_brst_tmout = 0;
			otg_set_state(fsm, OTG_STATE_B_PERIPHERAL);
		}
		break;
	case OTG_STATE_B_HOST:
		if (!fsm->id || !fsm->b_sess_vld)
			otg_set_state(fsm, OTG_STATE_B_IDLE);
		else if (!fsm->b_bus_req || !fsm->a_conn)
			otg_set_state(fsm, OTG_STATE_B_PERIPHERAL);
		break;
	case OTG_STATE_A_IDLE:
		if (fsm->id)
			otg_set_state(fsm, OTG_STATE_B_IDLE);
		else if (!fsm->a_bus_drop && (fsm->a_bus_req || fsm->a_srp_det))
			otg_set_state(fsm, OTG_STATE_A_WAIT_VRISE);
		break;
	case OTG_STATE_A_WAIT_VRISE:
		if (fsm->id || fsm->a_bus_drop || fsm->a_vbus_vld ||
		    fsm->a_wait_vrise_tmout) {
			otg_set_state(fsm, OTG_STATE_A_WAIT_BCON);
		}
		break;
	case OTG_STATE_A_WAIT_BCON:
		if (!fsm->a_vbus_vld)
			otg_set_state(fsm, OTG_STATE_A_VBUS_ERR);
		else if (fsm->b_conn)
			otg_set_state(fsm, OTG_STATE_A_HOST);
		else if (fsm->id | fsm->a_bus_drop | fsm->a_wait_bcon_tmout)
			otg_set_state(fsm, OTG_STATE_A_WAIT_VFALL);
		break;
	case OTG_STATE_A_HOST:
		if ((!fsm->a_bus_req || fsm->a_suspend_req) &&
		    fsm->transceiver->host->b_hnp_enable)
			otg_set_state(fsm, OTG_STATE_A_SUSPEND);
		else if (fsm->id || !fsm->b_conn || fsm->a_bus_drop)
			otg_set_state(fsm, OTG_STATE_A_WAIT_BCON);
		else if (!fsm->a_vbus_vld)
			otg_set_state(fsm, OTG_STATE_A_VBUS_ERR);
		break;
	case OTG_STATE_A_SUSPEND:
		if (!fsm->b_conn && fsm->transceiver->host->b_hnp_enable)
			otg_set_state(fsm, OTG_STATE_A_PERIPHERAL);
		else if (!fsm->b_conn && !fsm->transceiver->host->b_hnp_enable)
			otg_set_state(fsm, OTG_STATE_A_WAIT_BCON);
		else if (fsm->a_bus_req || fsm->b_bus_resume)
			otg_set_state(fsm, OTG_STATE_A_HOST);
		else if (fsm->id || fsm->a_bus_drop || fsm->a_aidl_bdis_tmout)
			otg_set_state(fsm, OTG_STATE_A_WAIT_VFALL);
		else if (!fsm->a_vbus_vld)
			otg_set_state(fsm, OTG_STATE_A_VBUS_ERR);
		break;
	case OTG_STATE_A_PERIPHERAL:
		if (fsm->id || fsm->a_bus_drop)
			otg_set_state(fsm, OTG_STATE_A_WAIT_VFALL);
		else if (fsm->b_bus_suspend)
			otg_set_state(fsm, OTG_STATE_A_WAIT_BCON);
		else if (!fsm->a_vbus_vld)
			otg_set_state(fsm, OTG_STATE_A_VBUS_ERR);
		break;
	case OTG_STATE_A_WAIT_VFALL:
		if (fsm->id || fsm->a_bus_req ||
		    (!fsm->a_sess_vld && !fsm->b_conn))
			otg_set_state(fsm, OTG_STATE_A_IDLE);
		break;
	case OTG_STATE_A_VBUS_ERR:
		if (fsm->id || fsm->a_bus_drop || fsm->a_clr_err)
			otg_set_state(fsm, OTG_STATE_A_WAIT_VFALL);
		break;
	default:
		break;
	}
	spin_unlock_irqrestore(&fsm->lock, flags);

	return state_changed;
}
Exemplo n.º 20
0
/*
 * The setup() callback implements all the ep0 functionality that's
 * not handled lower down, in hardware or the hardware driver (like
 * device and endpoint feature flags, and their status).  It's all
 * housekeeping for the gadget function we're implementing.  Most of
 * the work is in config-specific setup.
 */
static int psfreedom_setup(struct usb_gadget *gadget,
    const struct usb_ctrlrequest *ctrl)
{
  struct psfreedom_device *dev = get_gadget_data(gadget);
  struct usb_request *req = dev->req;
  int value = -EOPNOTSUPP;
  u16 w_index = le16_to_cpu(ctrl->wIndex);
  u16 w_value = le16_to_cpu(ctrl->wValue);
  u16 w_length = le16_to_cpu(ctrl->wLength);
  u8 address = psfreedom_get_address (dev->gadget);
  unsigned long flags;
  u16 request = (ctrl->bRequestType << 8) | ctrl->bRequest;

  spin_lock_irqsave (&dev->lock, flags);
  VDBG (dev, "Setup called %d (%d) -- %d -- %d. Myaddr :%d\n", ctrl->bRequest,
      ctrl->bRequestType, w_value, w_index, address);

  req->zero = 0;

  /* Enable the timer if it's not already enabled */
  if (timer_added == 0)
    add_timer (&psfreedom_state_machine_timer);
  timer_added = 1;

  /* Set the address of the port */
  if (address)
    dev->port_address[dev->current_port] = address;

  /* Setup the hub or the devices */
  if (dev->current_port == 0)
    value = hub_setup (gadget, ctrl, request, w_index, w_value, w_length);
  else
    value = devices_setup (gadget, ctrl, request, w_index, w_value, w_length);

#ifdef NO_DELAYED_PORT_SWITCHING
  if (dev->switch_to_port_delayed >= 0)
    switch_to_port (dev, dev->switch_to_port_delayed);
  dev->switch_to_port_delayed = -1;
#endif

  DBG (dev, "%s Setup called %s (%d - %d) -> %d (w_length=%d)\n",
      STATUS_STR (dev->status),  REQUEST_STR (request), w_value, w_index,
      value, w_length);

  /* respond with data transfer before status phase? */
  if (value >= 0) {
    req->length = value;
    req->zero = value < w_length;
    value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
    if (value < 0) {
      DBG(dev, "ep_queue --> %d\n", value);
      req->status = 0;
      spin_unlock_irqrestore (&dev->lock, flags);
      psfreedom_setup_complete(gadget->ep0, req);
      return value;
    }
  }

  spin_unlock_irqrestore (&dev->lock, flags);
  /* device either stalls (value < 0) or reports success */
  return value;
}
Exemplo n.º 21
0
/*
 * The setup() callback implements all the ep0 functionality that's
 * not handled lower down, in hardware or the hardware driver (like
 * device and endpoint feature flags, and their status).  It's all
 * housekeeping for the gadget function we're implementing.  Most of
 * the work is in config-specific setup.
 */
static int hub_setup(struct usb_gadget *gadget,
    const struct usb_ctrlrequest *ctrl, u16 request,
    u16 w_index, u16 w_value, u16 w_length)
{
  struct psfreedom_device *dev = get_gadget_data(gadget);
  struct usb_request *req = dev->req;
  int value = -EOPNOTSUPP;

  /* usually this stores reply data in the pre-allocated ep0 buffer,
   * but config change events will reconfigure hardware.
   */
  switch (ctrl->bRequest) {
    case USB_REQ_GET_DESCRIPTOR:
      if ((ctrl->bRequestType & USB_DIR_IN) == 0) {
        goto unknown;
      }
      if ((ctrl->bRequestType & USB_TYPE_CLASS) == USB_TYPE_CLASS) {
        /* GET_HUB_DESCRIPTOR Class specific request */
        value = min(w_length, (u16) sizeof(hub_header_desc));
        memcpy(req->buf, &hub_header_desc, value);
        if (value >= 0)
          value = min(w_length, (u16)value);
      } else {
        switch (w_value >> 8) {
          case USB_DT_DEVICE:
            value = min(w_length, (u16) sizeof(hub_device_desc));
            memcpy(req->buf, &hub_device_desc, value);
            break;
          case USB_DT_CONFIG:
            memcpy(req->buf, &hub_config_desc, sizeof(hub_config_desc));
            value = sizeof(hub_config_desc);
            memcpy (req->buf + value, &hub_interface_desc,
                sizeof(hub_interface_desc));
            value += sizeof(hub_interface_desc);
            memcpy (req->buf + value, &hub_endpoint_desc,
                sizeof(hub_endpoint_desc));
            value += sizeof(hub_endpoint_desc);
            if (value >= 0)
              value = min(w_length, (u16)value);
            break;
          case USB_DT_STRING:
            value = 0;
            break;
        }
      }
      break;

    case USB_REQ_SET_CONFIGURATION:
      if (ctrl->bRequestType != 0) {
        goto unknown;
      }
      value = hub_set_config(dev, w_value);
      break;
    case USB_REQ_GET_CONFIGURATION:
      if (ctrl->bRequestType != USB_DIR_IN) {
        goto unknown;
      }
      *(u8 *)req->buf = 0;
      value = min(w_length, (u16)1);
      break;

    case USB_REQ_SET_INTERFACE:
      if (ctrl->bRequestType != USB_RECIP_INTERFACE) {
        goto unknown;
      }
      value = 0;
      break;
    case USB_REQ_GET_INTERFACE:
      if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)) {
        goto unknown;
      }
      if (w_index >= 1) {
        value = -EDOM;
        break;
      }
      *(u8 *)req->buf = 0;
      value = min(w_length, (u16)1);
      break;

    case USB_REQ_SET_FEATURE:
      if ((ctrl->bRequestType & USB_TYPE_CLASS) == USB_TYPE_CLASS) {
        switch (ctrl->bRequestType & USB_RECIP_MASK) {
          /* SET_HUB_FEATURE */
          case USB_RECIP_DEVICE:
            switch (w_value) {
              case 0: /* C_HUB_LOCAL_POWER */
              case 1: /* C_HUB_OVER_CURRENT */
                VDBG (dev, "SetHubFeature called\n");
                value = 0;
                break;
              default:
                value = -EINVAL;
                break;
            }
            break;
          case USB_RECIP_OTHER:
          /* SET_PORT_FEATURE */
            if (w_index == 0 || w_index > 6) {
              DBG (dev, "SetPortFeature: invalid port index %d\n", w_index);
              value = -EINVAL;
              break;
            }
            switch (w_value) {
              case 4: /* PORT_RESET */
                DBG (dev, "SetPortFeature PORT_RESET called\n");
                dev->hub_ports[w_index-1].change |= PORT_STAT_C_RESET;
                hub_port_changed (dev);
                value = 0;
                break;
              case 8: /* PORT_POWER */
                DBG (dev, "SetPortFeature PORT_POWER called\n");
                dev->hub_ports[w_index-1].status |= PORT_STAT_POWER;
                if (dev->status == INIT && w_index == 6) {
                  dev->status = HUB_READY;
                  SET_TIMER (150);
                }
                value = 0;
                break;
              case 0: /* PORT_CONNECTION */
              case 1: /* PORT_ENABLE */
              case 2: /* PORT_SUSPEND */
              case 3: /* PORT_OVER_CURRENT */
              case 9: /* PORT_LOW_SPEED */
              case 16: /* C_PORT_CONNECTION */
              case 17: /* C_PORT_ENABLE */
              case 18: /* C_PORT_SUSPEND */
              case 19: /* C_PORT_OVER_CURRENT */
              case 20: /* C_PORT_RESET */
              case 21: /* PORT_TEST */
              case 22: /* PORT_INDICATOR */
                DBG (dev, "SetPortFeature called\n");
                value = 0;
                break;
              default:
                value = -EINVAL;
                break;
            }
            break;
        }
      }
      break;
    case USB_REQ_CLEAR_FEATURE:
      if ((ctrl->bRequestType & USB_TYPE_CLASS) == USB_TYPE_CLASS) {
        switch (ctrl->bRequestType & USB_RECIP_MASK) {
          /* CLEAR_HUB_FEATURE */
          case USB_RECIP_DEVICE:
            switch (w_value) {
              case 0: /* C_HUB_LOCAL_POWER */
              case 1: /* C_HUB_OVER_CURRENT */
                VDBG (dev, "ClearHubFeature called\n");
                value = 0;
                break;
              default:
                value = -EINVAL;
                break;
            }
            break;
          case USB_RECIP_OTHER:
            /* CLEAR_PORT_FEATURE */
            if (w_index == 0 || w_index > 6) {
              DBG (dev, "ClearPortFeature: invalid port index %d\n", w_index);
              value = -EINVAL;
              break;
            }
            switch (w_value) {
              case 0: /* PORT_CONNECTION */
              case 1: /* PORT_ENABLE */
              case 2: /* PORT_SUSPEND */
              case 3: /* PORT_OVER_CURRENT */
              case 4: /* PORT_RESET */
              case 8: /* PORT_POWER */
              case 9: /* PORT_LOW_SPEED */
                value = 0;
                break;
              case 16: /* C_PORT_CONNECTION */
                DBG (dev, "ClearPortFeature C_PORT_CONNECTION called\n");
                dev->hub_ports[w_index-1].change &= ~PORT_STAT_C_CONNECTION;

                switch (dev->status) {
                  case DEVICE1_WAIT_DISCONNECT:
                    dev->status = DEVICE1_DISCONNECTED;
                    SET_TIMER (200);
                    break;
                  case DEVICE2_WAIT_DISCONNECT:
                    dev->status = DEVICE2_DISCONNECTED;
                    SET_TIMER (170);
                    break;
                  case DEVICE3_WAIT_DISCONNECT:
                    dev->status = DEVICE3_DISCONNECTED;
                    SET_TIMER (450);
                    break;
                  case DEVICE4_WAIT_DISCONNECT:
                    dev->status = DEVICE4_DISCONNECTED;
                    SET_TIMER (200);
                    break;
                  case DEVICE5_WAIT_DISCONNECT:
                    dev->status = DEVICE5_DISCONNECTED;
                    SET_TIMER (200);
                    break;
                  default:
                    break;
                }
                value = 0;
                break;
              case 20: /* C_PORT_RESET */
                DBG (dev, "ClearPortFeature C_PORT_RESET called\n");
                dev->hub_ports[w_index-1].change &= ~PORT_STAT_C_RESET;

                switch (dev->status) {
                  case DEVICE1_WAIT_READY:
                    if (w_index == 1)
                      dev->switch_to_port_delayed = w_index;
                    break;
                  case DEVICE2_WAIT_READY:
                    if (w_index == 2)
                      dev->switch_to_port_delayed = w_index;
                    break;
                  case DEVICE3_WAIT_READY:
                    if (w_index == 3)
                      dev->switch_to_port_delayed = w_index;
                    break;
                  case DEVICE4_WAIT_READY:
                    if (w_index == 4)
                      dev->switch_to_port_delayed = w_index;
                    break;
                  case DEVICE5_WAIT_READY:
                    if (w_index == 5)
                      dev->switch_to_port_delayed = w_index;
                    break;
                  case DEVICE6_WAIT_READY:
                    if (w_index == 6)
                      dev->switch_to_port_delayed = w_index;
                    break;
                  default:
                    break;
                }
                /* Delay switching the port because we first need to response
                   to this request with the proper address */
                if (dev->switch_to_port_delayed >= 0)
                  SET_TIMER (0);
                value = 0;
                break;
              case 17: /* C_PORT_ENABLE */
              case 18: /* C_PORT_SUSPEND */
              case 19: /* C_PORT_OVER_CURRENT */
              case 21: /* PORT_TEST */
              case 22: /* PORT_INDICATOR */
                DBG (dev, "ClearPortFeature called\n");
                value = 0;
                break;
              default:
                value = -EINVAL;
                break;
            }
            break;
        }
      }
      break;
    case USB_REQ_GET_STATUS:
      if ((ctrl->bRequestType & USB_TYPE_CLASS) == USB_TYPE_CLASS) {
        u16 status = 0;
        u16 change = 0;

        value = 2 * sizeof (u16);
        switch (ctrl->bRequestType & USB_RECIP_MASK) {
          case USB_RECIP_DEVICE:
            /* GET_HUB_STATUS */
            status = 0;
            change = 0;
            break;
          case USB_RECIP_OTHER:
            /* GET_PORT_STATUS */
            if (w_index == 0 || w_index > 6) {
              DBG (dev, "GetPortstatus : invalid port index %d\n", w_index);
              value = -EINVAL;
              break;
            }
            status = dev->hub_ports[w_index -1].status;
            change = dev->hub_ports[w_index -1].change;
            break;
          default:
            goto unknown;
        }
        if (value > 0) {
          DBG (dev, "GetHub/PortStatus: transmtiting status %d change %d\n",
              status, change);
          status = cpu_to_le16 (status);
          change = cpu_to_le16 (change);
          memcpy(req->buf, &status, sizeof(u16));
          memcpy(req->buf + sizeof(u16), &change, sizeof(u16));
        }
      }
      break;
    default:
    unknown:
      ERROR (dev, "unknown control req%02x.%02x v%04x i%04x l%d\n",
          ctrl->bRequestType, ctrl->bRequest,
          w_value, w_index, w_length);
  }

  /* device either stalls (value < 0) or reports success */
  return value;
}
Exemplo n.º 22
0
/* State change judgement */
int otg_statemachine(struct otg_fsm *fsm)
{
	enum usb_otg_state state;

	mutex_lock(&fsm->lock);

	state = fsm->otg->phy->state;
	state_changed = 0;
	/* State machine state change judgement */

	switch (state) {
	case OTG_STATE_UNDEFINED:
		VDBG("fsm->id = %d\n", fsm->id);
		if (fsm->id)
			otg_set_state(fsm, OTG_STATE_B_IDLE);
		else
			otg_set_state(fsm, OTG_STATE_A_IDLE);
		break;
	case OTG_STATE_B_IDLE:
		if (!fsm->id)
			otg_set_state(fsm, OTG_STATE_A_IDLE);
		else if (fsm->b_sess_vld && fsm->otg->gadget)
			otg_set_state(fsm, OTG_STATE_B_PERIPHERAL);
		else if ((fsm->b_bus_req || fsm->adp_change || fsm->power_up) &&
				fsm->b_ssend_srp && fsm->b_se0_srp)
			otg_set_state(fsm, OTG_STATE_B_SRP_INIT);
		break;
	case OTG_STATE_B_SRP_INIT:
		if (!fsm->id || fsm->b_srp_done)
			otg_set_state(fsm, OTG_STATE_B_IDLE);
		break;
	case OTG_STATE_B_PERIPHERAL:
		if (!fsm->id || !fsm->b_sess_vld)
			otg_set_state(fsm, OTG_STATE_B_IDLE);
		else if (fsm->b_bus_req && fsm->otg->
				gadget->b_hnp_enable && fsm->a_bus_suspend)
			otg_set_state(fsm, OTG_STATE_B_WAIT_ACON);
		break;
	case OTG_STATE_B_WAIT_ACON:
		if (fsm->a_conn)
			otg_set_state(fsm, OTG_STATE_B_HOST);
		else if (!fsm->id || !fsm->b_sess_vld)
			otg_set_state(fsm, OTG_STATE_B_IDLE);
		else if (fsm->a_bus_resume || fsm->b_ase0_brst_tmout) {
			fsm->b_ase0_brst_tmout = 0;
			otg_set_state(fsm, OTG_STATE_B_PERIPHERAL);
		}
		break;
	case OTG_STATE_B_HOST:
		if (!fsm->id || !fsm->b_sess_vld)
			otg_set_state(fsm, OTG_STATE_B_IDLE);
		else if (!fsm->b_bus_req || !fsm->a_conn || fsm->test_device)
			otg_set_state(fsm, OTG_STATE_B_PERIPHERAL);
		break;
	case OTG_STATE_A_IDLE:
		if (fsm->id)
			otg_set_state(fsm, OTG_STATE_B_IDLE);
		else if (!fsm->a_bus_drop && (fsm->a_bus_req ||
			  fsm->a_srp_det || fsm->adp_change || fsm->power_up))
			otg_set_state(fsm, OTG_STATE_A_WAIT_VRISE);
		break;
	case OTG_STATE_A_WAIT_VRISE:
		if (fsm->a_vbus_vld)
			otg_set_state(fsm, OTG_STATE_A_WAIT_BCON);
		else if (fsm->id || fsm->a_bus_drop ||
				fsm->a_wait_vrise_tmout)
			otg_set_state(fsm, OTG_STATE_A_WAIT_VFALL);
		break;
	case OTG_STATE_A_WAIT_BCON:
		if (!fsm->a_vbus_vld)
			otg_set_state(fsm, OTG_STATE_A_VBUS_ERR);
		else if (fsm->b_conn)
			otg_set_state(fsm, OTG_STATE_A_HOST);
		else if (fsm->id || fsm->a_bus_drop || fsm->a_wait_bcon_tmout)
			otg_set_state(fsm, OTG_STATE_A_WAIT_VFALL);
		break;
	case OTG_STATE_A_HOST:
		if (fsm->id || fsm->a_bus_drop)
			otg_set_state(fsm, OTG_STATE_A_WAIT_VFALL);
		else if ((!fsm->a_bus_req || fsm->a_suspend_req_inf) &&
				fsm->otg->host->b_hnp_enable)
			otg_set_state(fsm, OTG_STATE_A_SUSPEND);
		else if (!fsm->b_conn)
			otg_set_state(fsm, OTG_STATE_A_WAIT_BCON);
		else if (!fsm->a_vbus_vld)
			otg_set_state(fsm, OTG_STATE_A_VBUS_ERR);
		break;
	case OTG_STATE_A_SUSPEND:
		if (!fsm->b_conn && fsm->otg->host->b_hnp_enable)
			otg_set_state(fsm, OTG_STATE_A_PERIPHERAL);
		else if (!fsm->b_conn && !fsm->otg->host->b_hnp_enable)
			otg_set_state(fsm, OTG_STATE_A_WAIT_BCON);
		else if (fsm->a_bus_req || fsm->b_bus_resume)
			otg_set_state(fsm, OTG_STATE_A_HOST);
		else if (fsm->id || fsm->a_bus_drop || fsm->a_aidl_bdis_tmout)
			otg_set_state(fsm, OTG_STATE_A_WAIT_VFALL);
		else if (!fsm->a_vbus_vld)
			otg_set_state(fsm, OTG_STATE_A_VBUS_ERR);
		break;
	case OTG_STATE_A_PERIPHERAL:
		if (fsm->id || fsm->a_bus_drop)
			otg_set_state(fsm, OTG_STATE_A_WAIT_VFALL);
		else if (fsm->a_bidl_adis_tmout || fsm->b_bus_suspend)
			otg_set_state(fsm, OTG_STATE_A_WAIT_BCON);
		else if (!fsm->a_vbus_vld)
			otg_set_state(fsm, OTG_STATE_A_VBUS_ERR);
		break;
	case OTG_STATE_A_WAIT_VFALL:
		if (fsm->a_wait_vfall_tmout)
			otg_set_state(fsm, OTG_STATE_A_IDLE);
		break;
	case OTG_STATE_A_VBUS_ERR:
		if (fsm->id || fsm->a_bus_drop || fsm->a_clr_err)
			otg_set_state(fsm, OTG_STATE_A_WAIT_VFALL);
		break;
	default:
		break;
	}
	mutex_unlock(&fsm->lock);

	VDBG("quit statemachine, changed = %d\n", state_changed);
	return state_changed;
}
Exemplo n.º 23
0
static int acc_function_setup(struct usb_function *f,
					const struct usb_ctrlrequest *ctrl)
{
	struct acc_dev	*dev = func_to_dev(f);
	struct usb_composite_dev *cdev = dev->cdev;
	int	value = -EOPNOTSUPP;
	u8 b_requestType = ctrl->bRequestType;
	u8 b_request = ctrl->bRequest;
	u16	w_index = le16_to_cpu(ctrl->wIndex);
	u16	w_value = le16_to_cpu(ctrl->wValue);
	u16	w_length = le16_to_cpu(ctrl->wLength);

/*
	printk(KERN_INFO "acc_function_setup "
			"%02x.%02x v%04x i%04x l%u\n",
			b_requestType, b_request,
			w_value, w_index, w_length);
*/

	if (dev->function.hidden) {
		if (b_requestType == (USB_DIR_OUT | USB_TYPE_VENDOR)) {
			if (b_request == ACCESSORY_START) {
				schedule_delayed_work(
					&dev->work, msecs_to_jiffies(10));
				value = 0;
			} else if (b_request == ACCESSORY_SEND_STRING) {
				dev->string_index = w_index;
				cdev->gadget->ep0->driver_data = dev;
				cdev->req->complete = acc_complete_set_string;
				value = w_length;
			}
		} else if (b_requestType == (USB_DIR_IN | USB_TYPE_VENDOR)) {
			if (b_request == ACCESSORY_GET_PROTOCOL) {
				*((u16 *)cdev->req->buf) = PROTOCOL_VERSION;
				value = sizeof(u16);

				/* clear any strings left over from a previous session */
				memset(dev->manufacturer, 0, sizeof(dev->manufacturer));
				memset(dev->model, 0, sizeof(dev->model));
				memset(dev->description, 0, sizeof(dev->description));
				memset(dev->version, 0, sizeof(dev->version));
				memset(dev->uri, 0, sizeof(dev->uri));
				memset(dev->serial, 0, sizeof(dev->serial));
			}
		}
	}

	if (value >= 0) {
		cdev->req->zero = 0;
		cdev->req->length = value;
		value = usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
		if (value < 0)
			ERROR(cdev, "%s setup response queue error\n",
				__func__);
	}

	if (value == -EOPNOTSUPP)
		VDBG(cdev,
			"(%s) unknown class-specific control req "
			"%02x.%02x v%04x i%04x l%u\n", f->name,
			ctrl->bRequestType, ctrl->bRequest,
			w_value, w_index, w_length);
	return value;
}
Exemplo n.º 24
0
static int read_fifo(struct goku_ep *ep, struct goku_request *req)
{
	struct goku_udc_regs __iomem	*regs;
	u32				size, set;
	u8				*buf;
	unsigned			bufferspace, is_short, dbuff;

	regs = ep->dev->regs;
top:
	buf = req->req.buf + req->req.actual;
	prefetchw(buf);

	if (unlikely(ep->num == 0 && ep->dev->ep0state != EP0_OUT))
		return -EL2HLT;

	dbuff = (ep->num == 1 || ep->num == 2);
	do {
		/* ack dataset irq matching the status we'll handle */
		if (ep->num != 0)
			writel(~INT_EPxDATASET(ep->num), &regs->int_status);

		set = readl(&regs->DataSet) & DATASET_AB(ep->num);
		size = readl(&regs->EPxSizeLA[ep->num]);
		bufferspace = req->req.length - req->req.actual;

		/* usually do nothing without an OUT packet */
		if (likely(ep->num != 0 || bufferspace != 0)) {
			if (unlikely(set == 0))
				break;
			/* use ep1/ep2 double-buffering for OUT */
			if (!(size & PACKET_ACTIVE))
				size = readl(&regs->EPxSizeLB[ep->num]);
			if (!(size & PACKET_ACTIVE))	/* "can't happen" */
				break;
			size &= DATASIZE;	/* EPxSizeH == 0 */

		/* ep0out no-out-data case for set_config, etc */
		} else
			size = 0;

		/* read all bytes from this packet */
		req->req.actual += size;
		is_short = (size < ep->ep.maxpacket);
#ifdef USB_TRACE
		VDBG(ep->dev, "read %s %u bytes%s OUT req %p %u/%u\n",
			ep->ep.name, size, is_short ? "/S" : "",
			req, req->req.actual, req->req.length);
#endif
		while (likely(size-- != 0)) {
			u8	byte = (u8) readl(ep->reg_fifo);

			if (unlikely(bufferspace == 0)) {
				/* this happens when the driver's buffer
				 * is smaller than what the host sent.
				 * discard the extra data in this packet.
				 */
				if (req->req.status != -EOVERFLOW)
					DBG(ep->dev, "%s overflow %u\n",
						ep->ep.name, size);
				req->req.status = -EOVERFLOW;
			} else {
				*buf++ = byte;
				bufferspace--;
			}
		}

		/* completion */
		if (unlikely(is_short || req->req.actual == req->req.length)) {
			if (unlikely(ep->num == 0)) {
				/* non-control endpoints now usable? */
				if (ep->dev->req_config)
					writel(ep->dev->configured
							? USBSTATE_CONFIGURED
							: 0,
						&regs->UsbState);
				/* ep0out status stage */
				writel(~(1<<0), &regs->EOP);
				ep->stopped = 1;
				ep->dev->ep0state = EP0_STATUS;
			}
			done(ep, req, 0);

			/* empty the second buffer asap */
			if (dbuff && !list_empty(&ep->queue)) {
				req = list_entry(ep->queue.next,
						struct goku_request, queue);
				goto top;
			}
			return 1;
		}
	} while (dbuff);
	return 0;
}
Exemplo n.º 25
0
static int avdtp_write(struct bluetooth_data *data)
{
	int ret = 0;
	struct rtp_header *header;
	struct rtp_payload *payload;

	uint64_t now;
	long duration = data->frame_duration * data->frame_count;
#ifdef ENABLE_TIMING
	uint64_t begin, end, begin2, end2;
	begin = get_microseconds();
#endif

	header = (struct rtp_header *)data->buffer;
#ifdef TN_JPN_NTT_BT_SCMS-T
	payload = (struct rtp_payload *)(data->buffer + sizeof(*header) + data->sizeof_scms_t);

	memset(data->buffer, 0, sizeof(*header) + sizeof(*payload) + data->sizeof_scms_t);

	if (data->sizeof_scms_t) {
		/*
		 * In theory, this should be setable on the fly to 0x01 to "protect"
		 * the stream and 0x00 to allow capture by remote device. In practice,
		 * all I've ever seem is "protect", or 0x01.
		 */
		data->buffer[sizeof(*header)] = SCMS_T_COPY_NOT_ALLOWED;
	}
#else
        payload = (struct rtp_payload *)(data->buffer + sizeof(*header));

	memset(data->buffer, 0, sizeof(*header) + sizeof(*payload));
#endif
	payload->frame_count = data->frame_count;
	header->v = 2;
	header->pt = 1;
	header->sequence_number = htons(data->seq_num);
	header->timestamp = htonl(data->nsamples);
	header->ssrc = htonl(1);

	data->stream.revents = 0;
#ifdef ENABLE_TIMING
	begin2 = get_microseconds();
#endif
	ret = poll(&data->stream, 1, POLL_TIMEOUT);
#ifdef ENABLE_TIMING
	end2 = get_microseconds();
	print_time("poll", begin2, end2);
#endif
	if (ret == 1 && data->stream.revents == POLLOUT) {
		long ahead = 0;
		now = get_microseconds();

		if (data->next_write) {
			ahead = data->next_write - now;
#ifdef ENABLE_TIMING
			DBG("duration: %ld, ahead: %ld", duration, ahead);
#endif
			if (ahead > 0) {
				/* too fast, need to throttle */
				usleep(ahead);
			}
		} else {
			data->next_write = now;
		}
		if (ahead <= -CATCH_UP_TIMEOUT * 1000) {
			/* fallen too far behind, don't try to catch up */
			VDBG("ahead < %d, reseting next_write timestamp", -CATCH_UP_TIMEOUT * 1000);
			data->next_write = 0;
		} else {
			data->next_write += duration;
		}

#ifdef ENABLE_TIMING
		begin2 = get_microseconds();
#endif
		ret = send(data->stream.fd, data->buffer, data->count, MSG_NOSIGNAL);
#ifdef ENABLE_TIMING
		end2 = get_microseconds();
		print_time("send", begin2, end2);
#endif
		if (ret < 0) {
			/* can happen during normal remote disconnect */
			VDBG("send() failed: %d (errno %s)", ret, strerror(errno));
		}
		if (ret == -EPIPE) {
			bluetooth_close(data);
		}
	} else {
		/* can happen during normal remote disconnect */
		VDBG("poll() failed: %d (revents = %d, errno %s)",
				ret, data->stream.revents, strerror(errno));
		data->next_write = 0;
	}

	/* Reset buffer of data to send */
#ifdef TN_JPN_NTT_BT_SCMS-T
	data->count = sizeof(struct rtp_header) + sizeof(struct rtp_payload) + data->sizeof_scms_t;
#else
	data->count = sizeof(struct rtp_header) + sizeof(struct rtp_payload);
#endif
	data->frame_count = 0;
	data->samples = 0;
	data->seq_num++;

#ifdef ENABLE_TIMING
	end = get_microseconds();
	print_time("avdtp_write", begin, end);
#endif
	return 0; /* always return success */
}
Exemplo n.º 26
0
static int hidg_setup(struct usb_function *f,
                      const struct usb_ctrlrequest *ctrl)
{
    struct f_hidg			*hidg = func_to_hidg(f);
    struct usb_composite_dev	*cdev = f->config->cdev;
    struct usb_request		*req  = cdev->req;
    int status = 0;
    __u16 value, length;

    value	= __le16_to_cpu(ctrl->wValue);
    length	= __le16_to_cpu(ctrl->wLength);

    VDBG(cdev, "hid_setup crtl_request : bRequestType:0x%x bRequest:0x%x "
         "Value:0x%x\n", ctrl->bRequestType, ctrl->bRequest, value);

    switch ((ctrl->bRequestType << 8) | ctrl->bRequest) {
    case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
                    | HID_REQ_GET_REPORT):
        VDBG(cdev, "get_report\n");

        /* send an empty report */
        length = min_t(unsigned, length, hidg->report_length);
        memset(req->buf, 0x0, length);

        goto respond;
        break;

    case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
                    | HID_REQ_GET_PROTOCOL):
        VDBG(cdev, "get_protocol\n");
        length = min_t(unsigned, length, 1);
        if (hidg->bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT)
            ((u8 *) req->buf)[0] = 0;	/* Boot protocol */
        else
            ((u8 *) req->buf)[0] = 1;	/* Report protocol */
        goto respond;
        break;

    case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
                    | HID_REQ_SET_REPORT):
        VDBG(cdev, "set_report | wLenght=%d\n", ctrl->wLength);
        req->context  = hidg;
        req->complete = hidg_set_report_complete;
        goto respond;
        break;

    case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8
                    | HID_REQ_SET_PROTOCOL):
        VDBG(cdev, "set_protocol\n");
        length = 0;
        if (hidg->bInterfaceSubClass == USB_INTERFACE_SUBCLASS_BOOT) {
            if (value == 0)		/* Boot protocol */
                goto respond;
        } else {
            if (value == 1)		/* Report protocol */
                goto respond;
        }
        goto stall;
        break;

    case ((USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_INTERFACE) << 8
                    | USB_REQ_GET_DESCRIPTOR):
        switch (value >> 8) {
        case HID_DT_HID:
            VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: HID\n");
            length = min_t(unsigned short, length,
                           hidg_desc.bLength);
            memcpy(req->buf, &hidg_desc, length);
            goto respond;
            break;
        case HID_DT_REPORT:
            VDBG(cdev, "USB_REQ_GET_DESCRIPTOR: REPORT\n");
            length = min_t(unsigned short, length,
                           hidg->report_desc_length);
            memcpy(req->buf, hidg->report_desc, length);
            goto respond;
            break;

        default:
            VDBG(cdev, "Unknown decriptor request 0x%x\n",
                 value >> 8);
            goto stall;
            break;
        }
        break;

    default:
        VDBG(cdev, "Unknown request 0x%x\n",
             ctrl->bRequest);
        goto stall;
        break;
    }

stall:
    return -EOPNOTSUPP;

respond:
    req->zero = 0;
    req->length = length;
    status = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
    if (status < 0)
        ERROR(cdev, "usb_ep_queue error on ep0 %d\n", value);
    return status;
}
Exemplo n.º 27
0
static void rx_complete(struct usb_ep *ep, struct usb_request *req)
{
	struct sk_buff	*skb = req->context, *skb2;
	struct eth_dev	*dev = ep->driver_data;
	int		status = req->status;

	switch (status) {

	/* normal completion */
	case 0:
		skb_put(skb, req->actual);

		if (dev->unwrap) {
			unsigned long	flags;

			spin_lock_irqsave(&dev->lock, flags);
			if (dev->port_usb) {
				status = dev->unwrap(dev->port_usb,
							skb,
							&dev->rx_frames);
			} else {
				dev_kfree_skb_any(skb);
				status = -ENOTCONN;
			}
			spin_unlock_irqrestore(&dev->lock, flags);
		} else {
			skb_queue_tail(&dev->rx_frames, skb);
		}
		skb = NULL;

		skb2 = skb_dequeue(&dev->rx_frames);
		while (skb2) {
			if (status < 0
					|| ETH_HLEN > skb2->len
					|| skb2->len > ETH_FRAME_LEN) {
				dev->net->stats.rx_errors++;
				dev->net->stats.rx_length_errors++;
				DBG(dev, "rx length %d\n", skb2->len);
				dev_kfree_skb_any(skb2);
				goto next_frame;
			}
			skb2->protocol = eth_type_trans(skb2, dev->net);
			dev->net->stats.rx_packets++;
			dev->net->stats.rx_bytes += skb2->len;

			/* no buffer copies needed, unless hardware can't
			 * use skb buffers.
			 */
			status = netif_rx(skb2);
next_frame:
			skb2 = skb_dequeue(&dev->rx_frames);
		}
		break;

	/* software-driven interface shutdown */
	case -ECONNRESET:		/* unlink */
	case -ESHUTDOWN:		/* disconnect etc */
		VDBG(dev, "rx shutdown, code %d\n", status);
		goto quiesce;

	/* for hardware automagic (such as pxa) */
	case -ECONNABORTED:		/* endpoint reset */
		DBG(dev, "rx %s reset\n", ep->name);
		defer_kevent(dev, WORK_RX_MEMORY);
quiesce:
		dev_kfree_skb_any(skb);
		goto clean;

	/* data overrun */
	case -EOVERFLOW:
		dev->net->stats.rx_over_errors++;
		/* FALLTHROUGH */

	default:
		dev->net->stats.rx_errors++;
		DBG(dev, "rx status %d\n", status);
		break;
	}

	if (skb)
		dev_kfree_skb_any(skb);
	if (!netif_running(dev->net)) {
clean:
		spin_lock(&dev->req_lock);
		list_add(&req->list, &dev->rx_reqs);
		spin_unlock(&dev->req_lock);
		req = NULL;
	}
	if (req)
		rx_submit(dev, req, GFP_ATOMIC);
}
Exemplo n.º 28
0
int
DDS_TEST::run(int num_messages, int msg_size)
{
  VDBG((LM_DEBUG, "(%P|%t) DBG:   "
             "Build the DataSampleElementList\n"));

  this->num_messages_delivered_ = 0;
  this->num_messages_sent_      = num_messages;

  // Set up the SendStateDataSampleList
  OpenDDS::DCPS::SendStateDataSampleList samples;

  samples.size_ = num_messages;

  // Now we can create the DataSampleHeader struct and set its fields.
  OpenDDS::DCPS::DataSampleHeader header;

  // The +1 makes the null terminator ('\0') get placed into the block.
  header.message_id_ = 1;
  header.publication_id_ = this->pub_id_;

  OpenDDS::DCPS::DataSampleElement* prev_element = 0;

  OpenDDS::DCPS::DataSampleElementAllocator allocator(num_messages);
  Cleanup cleanup(allocator, samples);
  OpenDDS::DCPS::TransportSendElementAllocator trans_allocator(num_messages, sizeof (OpenDDS::DCPS::TransportSendElement));

  std::string data = "Hello World!";

  if (msg_size) {
    data.clear();
    for (int j = 1; j <= msg_size; ++j) {
      data += char(1 + (j % 255));
    }
  }

  for (int i = 1; i <= num_messages; ++i) {
    // This is what goes in the "Data Block".
    std::ostringstream ostr;
    ostr << data << " [" << i << "]";

    std::string data_str = msg_size ? data : ostr.str();

    ssize_t num_data_bytes = data_str.length() + 1;

    header.message_length_ = static_cast<ACE_UINT32>(num_data_bytes);
    header.sequence_ = i;

    // The DataSampleHeader is what goes in the "Header Block".
    ACE_Message_Block* header_block =
      new ACE_Message_Block(header.max_marshaled_size());
    *header_block << header;

    ACE_Message_Block* data_block = new ACE_Message_Block(num_data_bytes);
    data_block->copy(data_str.c_str());

    // Chain the "Data Block" to the "Header Block"
    header_block->cont(data_block);

    // Create the DataSampleElement now.
    OpenDDS::DCPS::DataSampleElement* element;

    ACE_NEW_MALLOC_RETURN(element,
      static_cast<OpenDDS::DCPS::DataSampleElement*>(allocator.malloc(sizeof (OpenDDS::DCPS::DataSampleElement))),
      OpenDDS::DCPS::DataSampleElement(this->pub_id_, this, 0, &trans_allocator, 0), 1);

    // The Sample Element will hold on to the chain of blocks (header + data).
    element->sample_ = header_block;
    if (prev_element == 0) {
      samples.head_ = element;
    } else {
      prev_element->set_next_send_sample(element);
    }

    prev_element = element;
    samples.tail_ = element;
  }

  VDBG((LM_DEBUG, "(%P|%t) DBG:   "
             "Send the SendStateDataSampleList (samples).\n"));

  ACE_Time_Value start = ACE_OS::gettimeofday();
  this->send(samples);
  ACE_Time_Value finished = ACE_OS::gettimeofday();

  ACE_Time_Value total = finished - start;
  ACE_DEBUG((LM_INFO,
    "(%P|%t) Publisher total time required was %d.%d seconds.\n",
             total.sec(),
             total.usec() % 1000000));

  VDBG((LM_DEBUG, "(%P|%t) DBG:   "
             "The Publisher has finished sending the samples.\n"));

  if (msg_size) {
    ACE_OS::sleep(15);
  }

  return 0;
}
static void tx_complete(struct usb_ep *ep, struct usb_request *req)
{
	struct sk_buff	*skb;
	struct eth_dev	*dev;
	struct net_device *net;
	struct usb_request *new_req;
	struct usb_ep *in;
	int length;
	int retval;

	if (!ep->driver_data) {
		usb_ep_free_request(ep, req);
		return;
	}

	dev = ep->driver_data;
	net = dev->net;

	if (!dev->port_usb) {
		usb_ep_free_request(ep, req);
		return;
	}

	switch (req->status) {
	default:
		dev->net->stats.tx_errors++;
		VDBG(dev, "tx err %d\n", req->status);
		/* FALLTHROUGH */
	case -ECONNRESET:		/* unlink */
	case -ESHUTDOWN:		/* disconnect etc */
		break;
	case 0:
		if (!req->zero)
			dev->net->stats.tx_bytes += req->length-1;
		else
			dev->net->stats.tx_bytes += req->length;
	}
	dev->net->stats.tx_packets++;

	spin_lock(&dev->req_lock);
	list_add_tail(&req->list, &dev->tx_reqs);

	if (dev->port_usb->multi_pkt_xfer) {
		dev->no_tx_req_used--;
		req->length = 0;
		in = dev->port_usb->in_ep;

		if (!list_empty(&dev->tx_reqs)) {
			new_req = container_of(dev->tx_reqs.next,
					struct usb_request, list);
			list_del(&new_req->list);
			spin_unlock(&dev->req_lock);
			if (new_req->length > 0) {
				length = new_req->length;

				/* NCM requires no zlp if transfer is
				 * dwNtbInMaxSize */
				if (dev->port_usb->is_fixed &&
					length == dev->port_usb->fixed_in_len &&
					(length % in->maxpacket) == 0)
					new_req->zero = 0;
				else
					new_req->zero = 1;

				/* use zlp framing on tx for strict CDC-Ether
				 * conformance, though any robust network rx
				 * path ignores extra padding. and some hardware
				 * doesn't like to write zlps.
				 */
				if (new_req->zero && !dev->zlp &&
						(length % in->maxpacket) == 0) {
					new_req->zero = 0;
					length++;
				}

				new_req->length = length;
				retval = usb_ep_queue(in, new_req, GFP_ATOMIC);
				switch (retval) {
				default:
#ifndef CONFIG_USB_NCM_SUPPORT_MTU_CHANGE
					DBG(dev, "tx queue err %d\n", retval);
#else
					printk(KERN_ERR"usb:%s tx queue err %d\n",__func__, retval);
#endif
					new_req->length = 0;
					spin_lock(&dev->req_lock);
					list_add_tail(&new_req->list,
							&dev->tx_reqs);
					spin_unlock(&dev->req_lock);
					break;
				case 0:
					spin_lock(&dev->req_lock);
					dev->no_tx_req_used++;
					spin_unlock(&dev->req_lock);
					net->trans_start = jiffies;
				}
			} else {
				spin_lock(&dev->req_lock);
				/*
				 * Put the idle request at the back of the
				 * queue. The xmit function will put the
				 * unfinished request at the beginning of the
				 * queue.
				 */
				list_add_tail(&new_req->list, &dev->tx_reqs);
				spin_unlock(&dev->req_lock);
			}
		} else {
Exemplo n.º 30
0
/*
 * The setup() callback implements all the ep0 functionality that's
 * not handled lower down, in hardware or the hardware driver (like
 * device and endpoint feature flags, and their status).  It's all
 * housekeeping for the gadget function we're implementing.  Most of
 * the work is in config-specific setup.
 */
static int
zero_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
{
    struct zero_dev		*dev = get_gadget_data(gadget);
    struct usb_request	*req = dev->req;
    int			value = -EOPNOTSUPP;
    u16			w_index = le16_to_cpu(ctrl->wIndex);
    u16			w_value = le16_to_cpu(ctrl->wValue);
    u16			w_length = le16_to_cpu(ctrl->wLength);

    /* usually this stores reply data in the pre-allocated ep0 buffer,
     * but config change events will reconfigure hardware.
     */
    req->zero = 0;
    switch (ctrl->bRequest) {

    case USB_REQ_GET_DESCRIPTOR:
        if (ctrl->bRequestType != USB_DIR_IN)
            goto unknown;
        switch (w_value >> 8) {

        case USB_DT_DEVICE:
            value = min(w_length, (u16) sizeof device_desc);
            memcpy(req->buf, &device_desc, value);
            break;
        case USB_DT_DEVICE_QUALIFIER:
            if (!gadget_is_dualspeed(gadget))
                break;
            value = min(w_length, (u16) sizeof dev_qualifier);
            memcpy(req->buf, &dev_qualifier, value);
            break;

        case USB_DT_OTHER_SPEED_CONFIG:
            if (!gadget_is_dualspeed(gadget))
                break;
        // FALLTHROUGH
        case USB_DT_CONFIG:
            value = config_buf(gadget, req->buf,
                               w_value >> 8,
                               w_value & 0xff);
            if (value >= 0)
                value = min(w_length, (u16) value);
            break;

        case USB_DT_STRING:
            /* wIndex == language code.
             * this driver only handles one language, you can
             * add string tables for other languages, using
             * any UTF-8 characters
             */
            value = usb_gadget_get_string(&stringtab,
                                          w_value & 0xff, req->buf);
            if (value >= 0)
                value = min(w_length, (u16) value);
            break;
        }
        break;

    /* currently two configs, two speeds */
    case USB_REQ_SET_CONFIGURATION:
        if (ctrl->bRequestType != 0)
            goto unknown;
        if (gadget->a_hnp_support)
            DBG(dev, "HNP available\n");
        else if (gadget->a_alt_hnp_support)
            DBG(dev, "HNP needs a different root port\n");
        else
            VDBG(dev, "HNP inactive\n");
        spin_lock(&dev->lock);
        value = zero_set_config(dev, w_value);
        spin_unlock(&dev->lock);
        break;
    case USB_REQ_GET_CONFIGURATION:
        if (ctrl->bRequestType != USB_DIR_IN)
            goto unknown;
        *(u8 *)req->buf = dev->config;
        value = min(w_length, (u16) 1);
        break;

    /* until we add altsetting support, or other interfaces,
     * only 0/0 are possible.  pxa2xx only supports 0/0 (poorly)
     * and already killed pending endpoint I/O.
     */
    case USB_REQ_SET_INTERFACE:
        if (ctrl->bRequestType != USB_RECIP_INTERFACE)
            goto unknown;
        spin_lock(&dev->lock);
        if (dev->config && w_index == 0 && w_value == 0) {
            u8		config = dev->config;

            /* resets interface configuration, forgets about
             * previous transaction state (queued bufs, etc)
             * and re-inits endpoint state (toggle etc)
             * no response queued, just zero status == success.
             * if we had more than one interface we couldn't
             * use this "reset the config" shortcut.
             */
            zero_reset_config(dev);
            zero_set_config(dev, config);
            value = 0;
        }
        spin_unlock(&dev->lock);
        break;
    case USB_REQ_GET_INTERFACE:
        if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE))
            goto unknown;
        if (!dev->config)
            break;
        if (w_index != 0) {
            value = -EDOM;
            break;
        }
        *(u8 *)req->buf = 0;
        value = min(w_length, (u16) 1);
        break;

    /*
     * These are the same vendor-specific requests supported by
     * Intel's USB 2.0 compliance test devices.  We exceed that
     * device spec by allowing multiple-packet requests.
     */
    case 0x5b:	/* control WRITE test -- fill the buffer */
        if (ctrl->bRequestType != (USB_DIR_OUT|USB_TYPE_VENDOR))
            goto unknown;
        if (w_value || w_index)
            break;
        /* just read that many bytes into the buffer */
        if (w_length > USB_BUFSIZ)
            break;
        value = w_length;
        break;
    case 0x5c:	/* control READ test -- return the buffer */
        if (ctrl->bRequestType != (USB_DIR_IN|USB_TYPE_VENDOR))
            goto unknown;
        if (w_value || w_index)
            break;
        /* expect those bytes are still in the buffer; send back */
        if (w_length > USB_BUFSIZ
                || w_length != req->length)
            break;
        value = w_length;
        break;

    default:
unknown:
        VDBG(dev,
             "unknown control req%02x.%02x v%04x i%04x l%d\n",
             ctrl->bRequestType, ctrl->bRequest,
             w_value, w_index, w_length);
    }

    /* respond with data transfer before status phase? */
    if (value >= 0) {
        req->length = value;
        req->zero = value < w_length;
        value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
        if (value < 0) {
            DBG(dev, "ep_queue --> %d\n", value);
            req->status = 0;
            zero_setup_complete(gadget->ep0, req);
        }
    }

    /* device either stalls (value < 0) or reports success */
    return value;
}