USB_GET_STATUS(9) USB Core APIs USB_GET_STATUS(9)NAME
usb_get_status - issues a GET_STATUS call
int usb_get_status(struct usb_device * dev, int type, int target, void * data);
the device whose status is being checked
USB_RECIP_*; for device, interface, or endpoint
zero (for device), else interface or endpoint number
pointer to two bytes of bitmap data
Returns device, interface, or endpoint status. Normally only of interest to see if the device is self powered, or has enabled the remote
wakeup facility; or whether a bulk or interrupt endpoint is halted ("stalled").
Bits in these status bitmaps are set using the SET_FEATURE request, and cleared using the CLEAR_FEATURE request. The usb_clear_halt
function should be used to clear halt ("stall") status.
This call is synchronous, and may not be used in an interrupt context.
Returns 0 and the status value in *data (in host byte order) on success, or else the status code from the underlying usb_control_msg call.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 USB_GET_STATUS(9)
Check Out this Related Man Page
USB_CONTROL_MSG(9) USB Core APIs USB_CONTROL_MSG(9)NAME
usb_control_msg - Builds a control urb, sends it off and waits for completion
int usb_control_msg(struct usb_device * dev, unsigned int pipe, __u8 request, __u8 requesttype, __u16 value, __u16 index, void * data,
__u16 size, int timeout);
pointer to the usb device to send the message to
endpoint "pipe" to send the message to
USB message request value
USB message request type value
USB message value
USB message index value
pointer to the data to send
length in bytes of the data to send
time in msecs to wait for the message to complete before timing out (if 0 the wait is forever)
This function sends a simple control message to a specified endpoint and waits for the message to complete, or timeout.
If successful, it returns the number of bytes transferred, otherwise a negative error number.
Don't use this function from within an interrupt context, like a bottom half handler. If you need an asynchronous message, or need to send
a message from within interrupt context, use usb_submit_urb. If a thread in your driver uses this call, make sure your disconnect method
can wait for it to complete. Since you don't have a handle on the URB used, you can't cancel the request.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 USB_CONTROL_MSG(9)
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