void usbnet_cdc_status(struct usbnet *dev, struct urb *urb)
{
struct usb_cdc_notification *event;
if (urb->actual_length < sizeof(*event))
return;
/* SPEED_CHANGE can get split into two 8-byte packets */
if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
dumpspeed(dev, (__le32 *) urb->transfer_buffer);
return;
}
event = urb->transfer_buffer;
switch (event->bNotificationType) {
case USB_CDC_NOTIFY_NETWORK_CONNECTION:
netif_dbg(dev, timer, dev->net, "CDC: carrier %s\n",
event->wValue ? "on" : "off");
/* Work-around for devices with broken off-notifications */
if (event->wValue &&
!test_bit(__LINK_STATE_NOCARRIER, &dev->net->state))
usbnet_link_change(dev, 0, 0);
usbnet_link_change(dev, !!event->wValue, 0);
break;
case USB_CDC_NOTIFY_SPEED_CHANGE: /* tx/rx rates */
netif_dbg(dev, timer, dev->net, "CDC: speed change (len %d)\n",
urb->actual_length);
if (urb->actual_length != (sizeof(*event) + 8))
set_bit(EVENT_STS_SPLIT, &dev->flags);
else
dumpspeed(dev, (__le32 *) &event[1]);
break;
/* USB_CDC_NOTIFY_RESPONSE_AVAILABLE can happen too (e.g. RNDIS),
* but there are no standard formats for the response data.
*/
default:
netdev_err(dev->net, "CDC: unexpected notification %02x!\n",
event->bNotificationType);
break;
}
}
static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
{
struct cdc_ncm_ctx *ctx;
struct usb_cdc_notification *event;
ctx = (struct cdc_ncm_ctx *)dev->data[0];
if (urb->actual_length < sizeof(*event))
return;
/* test for split data in 8-byte chunks */
if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
cdc_ncm_speed_change(ctx,
(struct usb_cdc_speed_change *)urb->transfer_buffer);
return;
}
event = urb->transfer_buffer;
switch (event->bNotificationType) {
case USB_CDC_NOTIFY_NETWORK_CONNECTION:
/*
* According to the CDC NCM specification ch.7.1
* USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
* sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
*/
ctx->connected = le16_to_cpu(event->wValue);
printk(KERN_INFO KBUILD_MODNAME ": %s: network connection:"
" %sconnected\n",
ctx->netdev->name, ctx->connected ? "" : "dis");
usbnet_link_change(dev, ctx->connected, 0);
if (!ctx->connected)
ctx->tx_speed = ctx->rx_speed = 0;
break;
case USB_CDC_NOTIFY_SPEED_CHANGE:
if (urb->actual_length < (sizeof(*event) +
sizeof(struct usb_cdc_speed_change)))
set_bit(EVENT_STS_SPLIT, &dev->flags);
else
cdc_ncm_speed_change(ctx,
(struct usb_cdc_speed_change *) &event[1]);
break;
default:
dev_dbg(&dev->udev->dev,
"NCM: unexpected notification 0x%02x!\n",
event->bNotificationType);
break;
}
}
static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
{
int ret;
/* MBIM backwards compatible function? */
cdc_ncm_select_altsetting(dev, intf);
if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting))
return -ENODEV;
/* NCM data altsetting is always 1 */
ret = cdc_ncm_bind_common(dev, intf, 1);
/*
* We should get an event when network connection is "connected" or
* "disconnected". Set network connection in "disconnected" state
* (carrier is OFF) during attach, so the IP network stack does not
* start IPv6 negotiation and more.
*/
usbnet_link_change(dev, 0, 0);
return ret;
}
/* Ensure correct link state
*
* Some devices (ZTE MF823/831/910) export two carrier on notifications when
* connected. This causes the link state to be incorrect. Work around this by
* always setting the state to off, then on.
*/
static void usbnet_cdc_zte_status(struct usbnet *dev, struct urb *urb)
{
struct usb_cdc_notification *event;
if (urb->actual_length < sizeof(*event))
return;
event = urb->transfer_buffer;
if (event->bNotificationType != USB_CDC_NOTIFY_NETWORK_CONNECTION) {
usbnet_cdc_status(dev, urb);
return;
}
netif_dbg(dev, timer, dev->net, "CDC: carrier %s\n",
event->wValue ? "on" : "off");
if (event->wValue &&
netif_carrier_ok(dev->net))
netif_carrier_off(dev->net);
usbnet_link_change(dev, !!event->wValue, 0);
}
