USB_STRING - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : USB Core APIs

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NAMEusb_string − returns UTF−8 version of a string descriptor

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SYNOPSISint usb_string(struct usb_device * dev, int index, char * buf, size_t size);

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ARGUMENTSdev the device whose string descriptor is being retrieved index the number of the descriptor buf where to put the string size how big is ‟buf”?

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CONTEXT!in_interrupt ()

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DESCRIPTIONThis 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​. Returns length of the string (>= 0) or usb_control_msg status (< 0)​.

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