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usb_string(9) [centos man page]

USB_STRING(9)							   USB Core APIs						     USB_STRING(9)

usb_string - returns UTF-8 version of a string descriptor SYNOPSIS
int usb_string(struct usb_device * dev, int index, char * buf, size_t size); ARGUMENTS
dev 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"? CONTEXT
!in_interrupt () DESCRIPTION
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. RETURN
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_get_string_descr(9F)				   Kernel Functions for Drivers 				  usb_get_string_descr(9F)

usb_get_string_descr - Get string descriptor from device SYNOPSIS
#include <sys/usb/usba.h> int usb_get_string_descr(dev_info_t *dip, uint16_t langid, uint8_t index, char *buf, size_t buflen); INTERFACE LEVEL
Solaris DDI specific (Solaris DDI) PARAMETERS
dip Pointer to the device's dev_info structure. langid Language ID. Currently only USB_LANG_ID (English ascii) is valid. index String index indicating descriptor to retrieve. buf Address into which the string descriptor is placed. buflen Size of buf in bytes. DESCRIPTION
The usb_get_string_descr() function retrieves a parsed string descriptor from a device. dip specifies the device, while index indicates which descriptor to return. String descriptors provide information about other descriptors, or information that is encoded in other descriptors, in readable form. Many descriptor types have one or more index fields which identify string descriptors. (See Sections 9.5 and 9.6 of the USB 2.0 specifica- tion.) For example, a configuration descriptor's seventh byte contains the string descriptor index describing a specific configuration. Retrieved descriptors that do not fit into buflen bytes are truncated. All returned descriptors are null-terminated. RETURN VALUES
USB_SUCCESS String descriptor is returned in buf. USB_INVALID_ARGS dip or buf are NULL, or index or buflen is 0. USB_FAILURE Descriptor cannot be retrieved. CONTEXT
May be called from user or kernel context. EXAMPLES
/* Get the first string descriptor. */ char buf[SIZE]; if (usb_get_string_descr( dip, USB_LANG_ID, 0, buf, SIZE) == USB_SUCCESS) { cmn_err (CE_NOTE, "%s%d: %s", ddi_driver_name(dip), ddi_get_instance(dip), buf); } ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Architecture |PCI-based systems | +-----------------------------+-----------------------------+ |Interface stability |Evolving | +-----------------------------+-----------------------------+ |Availability |SUNWusb | +-----------------------------+-----------------------------+ SEE ALSO
attributes(5), usb_get_dev_data(9F), usb_string_descr(9S) SunOS 5.10 5 Jan 2004 usb_get_string_descr(9F)
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