76 lines
1.6 KiB
Go
76 lines
1.6 KiB
Go
package usb
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// #cgo LDFLAGS: -lusb-1.0
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// #include <libusb-1.0/libusb.h>
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import "C"
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import (
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"reflect"
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"runtime"
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"unsafe"
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)
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type Context struct {
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ctx *C.libusb_context
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}
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func (c *Context) Debug(level int) {
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C.libusb_set_debug(c.ctx, C.int(level))
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}
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func NewContext() *Context {
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c := new(Context)
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//log.Printf("gousb initialized")
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if errno := C.libusb_init(&c.ctx); errno != 0 {
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panic(usbError(errno))
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}
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// This doesn't seem to actually get called. Sigh.
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runtime.SetFinalizer(c, (*Context).Close)
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return c
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}
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// ListDevices calls each with each enumerated device. If the function returns
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// true, the device is added to the list of *DeviceInfo to return. All of
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// these must be Closed, even if an error is also returned.
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func (c *Context) ListDevices(each func(bus, addr int, desc *Descriptor) bool) ([]*DeviceInfo, error) {
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var list **C.libusb_device
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cnt := C.libusb_get_device_list(c.ctx, &list)
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if cnt < 0 {
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return nil, usbError(cnt)
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}
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defer C.libusb_free_device_list(list, 1)
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var slice []*C.libusb_device
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*(*reflect.SliceHeader)(unsafe.Pointer(&slice)) = reflect.SliceHeader{
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Data: uintptr(unsafe.Pointer(list)),
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Len: int(cnt),
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Cap: int(cnt),
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}
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ret := []*DeviceInfo{}
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for _, dev := range slice {
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bus := int(C.libusb_get_bus_number(dev))
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addr := int(C.libusb_get_device_address(dev))
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desc, err := newDescriptor(dev)
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if err != nil {
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return ret, err
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}
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if each(bus, addr, desc) {
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ret = append(ret, newDeviceInfo(dev))
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}
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}
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return ret, nil
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}
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func (c *Context) Close() error {
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if c.ctx != nil {
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C.libusb_exit(c.ctx)
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//log.Printf("gousb finished")
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}
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c.ctx = nil
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return nil
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}
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