82 lines
1.7 KiB
Go
82 lines
1.7 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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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.
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// If the function returns true, the device is opened and a Device is returned if the operation succeeds.
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// Every Device returned (whether an error is also returned or not) must be closed.
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// If there are any errors enumerating the devices,
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// the final one is returned along with any successfully opened devices.
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func (c *Context) ListDevices(each func(desc *Descriptor) bool) ([]*Device, 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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var reterr error
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ret := []*Device{}
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for _, dev := range slice {
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desc, err := newDescriptor(dev)
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if err != nil {
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reterr = err
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continue
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}
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if each(desc) {
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var handle *C.libusb_device_handle
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if errno := C.libusb_open(dev, &handle); errno != 0 {
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reterr = err
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continue
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}
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ret = append(ret, newDevice(handle, desc))
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}
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}
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return ret, reterr
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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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}
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c.ctx = nil
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return nil
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}
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