USB_STRING(9) USB Core APIs USB_STRING(9)NAME
usb_string - returns UTF-8 version of a string descriptor
int usb_string(struct usb_device * dev, int index, char * buf, size_t size);
the device whose string descriptor is being retrieved
the number of the descriptor
where to put the string
how big is "buf"?
This converts the UTF-16LE encoded strings returned by devices, from usb_get_string_descriptor, to null-terminated UTF-8 encoded ones that
are more usable in most kernel contexts. Note that this function chooses strings in the first language supported by the device.
This call is synchronous, and may not be used in an interrupt context.
length of the string (>= 0) or usb_control_msg status (< 0).
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 USB_STRING(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.
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.
If successful, the number of bytes transferred. Otherwise, a negative error number.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 USB_CONTROL_MSG(9)
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