libusb_helper.h

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/* SPDX-License-Identifier: GPL-2.0-or-later */
 
/***************************************************************************
 *   Copyright (C) 2009 by Zachary T Welch <zw@superlucidity.net>          *
 *                                                                         *
 *   Copyright (C) 2011 by Mauro Gamba <maurillo71@gmail.com>              *
 ***************************************************************************/
 
#ifndef OPENOCD_JTAG_DRIVERS_LIBUSB_HELPER_H
#define OPENOCD_JTAG_DRIVERS_LIBUSB_HELPER_H
 
#include <libusb.h>
 
/* When we debug a target that works as a USB device, halting the target causes the
 * USB communication with the USB host to become unresponsive. The host will try
 * to reconnect/reset/setup the unresponsive device during which communication
 * with other devices on the same USB bus can get stalled for several seconds.
 * If the JTAG adapter is on the same bus, we need to make sure openOCD will wait
 * for packets at least as long as the host USB stack. Otherwise the USB stack
 * might deliver a valid packet, but openOCD would ignore it due to the timeout.
 * The xHCI spec uses 5 sec timeouts, so let's use that in openOCD with some margin.
 *
 * Use this value in all libusb calls. HID API might have a libusb backend and
 * would probably be victim to the same bug, so it should use this timeout, too.
 */
#define LIBUSB_TIMEOUT_MS   (6000)
 
/* this callback should return a non NULL value only when the serial could not
 * be retrieved by the standard 'libusb_get_string_descriptor_ascii' */
typedef char * (*adapter_get_alternate_serial_fn)(struct libusb_device_handle *device,
        struct libusb_device_descriptor *dev_desc);
 
int jtag_libusb_open(const uint16_t vids[], const uint16_t pids[],
        struct libusb_device_handle **out,
        adapter_get_alternate_serial_fn adapter_get_alternate_serial);
void jtag_libusb_close(struct libusb_device_handle *dev);
int jtag_libusb_control_transfer(struct libusb_device_handle *dev,
        uint8_t request_type, uint8_t request, uint16_t value,
        uint16_t index, char *bytes, uint16_t size, unsigned int timeout);
int jtag_libusb_bulk_write(struct libusb_device_handle *dev, int ep,
        char *bytes, int size, int timeout, int *transferred);
int jtag_libusb_bulk_read(struct libusb_device_handle *dev, int ep,
        char *bytes, int size, int timeout, int *transferred);
int jtag_libusb_set_configuration(struct libusb_device_handle *devh,
        int configuration);
int jtag_libusb_choose_interface(struct libusb_device_handle *devh,
        unsigned int *usb_read_ep,
        unsigned int *usb_write_ep,
        int bclass, int subclass, int protocol, int trans_type);
int jtag_libusb_get_pid(struct libusb_device *dev, uint16_t *pid);
int jtag_libusb_handle_events_completed(int *completed);
 
#endif /* OPENOCD_JTAG_DRIVERS_LIBUSB_HELPER_H */