USB_STRING(9) USB Core APIs USB_STRING(9)NAME
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.
Returns length of the string (>= 0) or usb_control_msg status (< 0).
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 USB_STRING(9)
Check Out this Related Man Page
usb_get_string_descr(9F) Kernel Functions for Drivers usb_get_string_descr(9F)NAME
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 |Committed |
+-----------------------------+-----------------------------+
|Availability |SUNWusb |
+-----------------------------+-----------------------------+
SEE ALSO attributes(5), usb_get_dev_data(9F), usb_string_descr(9S)SunOS 5.11 5 Jan 2004 usb_get_string_descr(9F)
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