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/***************************************************************************
* Copyright (C) 2009 by Zachary T Welch <zw@superlucidity.net> *
* *
* Copyright (C) 2011 by Mauro Gamba <maurillo71@gmail.com> *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/>. *
***************************************************************************/
#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);
/**
* Find the first interface optionally matching class, subclass and
* protocol and claim it.
* @param devh _libusb_ device handle.
* @param usb_read_ep A pointer to a variable where the _IN_ endpoint
* number will be stored.
* @param usb_write_ep A pointer to a variable where the _OUT_ endpoint
* number will be stored.
* @param bclass `bInterfaceClass` to match, or -1 to ignore this field.
* @param subclass `bInterfaceSubClass` to match, or -1 to ignore this field.
* @param protocol `bInterfaceProtocol` to match, or -1 to ignore this field.
* @param trans_type `bmAttributes Bits 0..1 Transfer type` to match, or -1 to ignore this field.
* @returns Returns ERROR_OK on success, ERROR_FAIL otherwise.
*/
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 */
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