/
operations.go
85 lines (74 loc) · 1.84 KB
/
operations.go
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package gusb
import (
"fmt"
"os"
"golang.org/x/sys/unix"
)
var debugLog = fmt.Printf
var errorLog = fmt.Printf
func Claim(f *os.File, ifno int32) error {
if r, errno := Ioctl(f, USBDEVFS_IOCTL, &IoctlPacket{
IfNo: ifno,
IoctlCode: int32(USBDEVFS_DISCONNECT), // disconn kernel driver
Data: 0,
}); errno == unix.ENODATA {
debugLog("no previous kernel driver attached")
} else if r == -1 {
errorLog("driver disconnect failed:", r, errno)
}
if r, errno := Ioctl(f, USBDEVFS_CLAIMINTERFACE, &ifno); r == -1 {
return errno
}
return nil
}
func Release(f *os.File, ifno int32) error {
if r, errno := Ioctl(f, USBDEVFS_RELEASEINTERFACE, &ifno); r == -1 {
return errno
}
if r, errno := Ioctl(f, USBDEVFS_IOCTL, &IoctlPacket{
IfNo: ifno,
IoctlCode: int32(USBDEVFS_CONNECT), //reconnect kernel driver
Data: 0,
}); r == -1 {
errorLog("driver connect failed:", r, errno)
}
return nil
}
func GetDriver(f *os.File, ifno int32) (string, error) {
drv := GetDriverS{
Interface: uint32(ifno),
}
_, err := Ioctl(f, USBDEVFS_GETDRIVER, &drv)
if err == unix.ENODATA { // empty if nothing is in use
// empty string?
} else if err != nil {
errorLog("Could not get driver", err.Error())
return "", err
}
return string(drv.Driver[:]), nil
}
func GetSpeed(f *os.File) (DeviceSpeed, error) {
r, err := Ioctl(f, USBDEVFS_GET_SPEED, nil)
if err != nil {
errorLog("Unable to get device speed", err)
return SpeedUnknown, err
}
return DeviceSpeed(r), nil
}
/*
func Ctl(f *os.File, d ...interface{}) (int, error) {
if r, err := Ioctl(f, USBDEVFS_CONTROL, &CtrlTransfer{
RequestType: uint8(d),
Request: uint8(d),
Value: uint16(d),
Index: uint16(d),
Length: uint16(len(d)),
Timeout: uint32(d),
Data: slicePtr(data),
}); r == -1 {
return -1, err
} else {
return r, nil
}
}
*/