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usbdev: Extract libusb1 device discovery into a separate file

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Currently there is a TODO-like comment in the dediprog driver: "Might be
useful for other USB devices as well". Act on this comment by collecting
all the device discovery code for libusb1 devices into a separate file.

Change-Id: Idfcc79371241c2c1dea97faf5e532aa971546a79
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-on: https://review.coreboot.org/27443
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
This commit is contained in:
Daniel Thompson
2018-07-12 11:02:28 +01:00
committed by Nico Huber
parent ccfa8f9d9a
commit 1d507a07a9
5 changed files with 141 additions and 108 deletions
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130
usbdev.c Normal file
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/*
* This file is part of the flashrom project.
*
* Copyright (C) 2016 secunet Security Networks AG
* Copyright (C) 2018 Linaro Limited
*
* 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.
*/
#include <string.h>
#include <libusb.h>
#include "programmer.h"
struct libusb_device_handle *usb_dev_get_by_vid_pid_serial(
struct libusb_context *usb_ctx, uint16_t vid, uint16_t pid, const char *serialno)
{
struct libusb_device **list;
ssize_t count = libusb_get_device_list(usb_ctx, &list);
if (count < 0) {
msg_perr("Getting the USB device list failed (%s)!\n", libusb_error_name(count));
return NULL;
}
ssize_t i = 0;
for (i = 0; i < count; i++) {
struct libusb_device *dev = list[i];
struct libusb_device_descriptor desc;
struct libusb_device_handle *handle;
int res = libusb_get_device_descriptor(dev, &desc);
if (res != 0) {
msg_perr("Reading the USB device descriptor failed (%s)!\n", libusb_error_name(res));
continue;
}
if ((desc.idVendor != vid) && (desc.idProduct != pid))
continue;
msg_pdbg("Found USB device %04"PRIx16":%04"PRIx16" at address %d-%d.\n",
desc.idVendor, desc.idProduct,
libusb_get_bus_number(dev), libusb_get_device_address(dev));
res = libusb_open(dev, &handle);
if (res != 0) {
msg_perr("Opening the USB device failed (%s)!\n", libusb_error_name(res));
continue;
}
if (serialno) {
unsigned char myserial[64];
res = libusb_get_string_descriptor_ascii(handle, desc.iSerialNumber, myserial,
sizeof(myserial));
if (res < 0) {
msg_perr("Reading the USB serialno failed (%s)!\n", libusb_error_name(res));
libusb_close(handle);
continue;
}
msg_pdbg("Serial number is %s\n", myserial);
/* Reject any serial number that does not commence with serialno */
if (0 != strncmp(serialno, (char *)myserial, strlen(serialno))) {
libusb_close(handle);
continue;
}
}
libusb_free_device_list(list, 1);
return handle;
}
libusb_free_device_list(list, 1);
return NULL;
}
/*
* This function allows different devices to be targeted based on enumeration order. Different
* hotplug sequencing (or simply a reboot) may change the enumeration order. This function should
* only be used if a programmers does not provide an alternative way to identify itself uniquely
* (such as a unique serial number).
*/
struct libusb_device_handle *usb_dev_get_by_vid_pid_number(
struct libusb_context *usb_ctx, uint16_t vid, uint16_t pid, unsigned int num)
{
struct libusb_device **list;
ssize_t count = libusb_get_device_list(usb_ctx, &list);
if (count < 0) {
msg_perr("Getting the USB device list failed (%s)!\n", libusb_error_name(count));
return NULL;
}
struct libusb_device_handle *handle = NULL;
ssize_t i = 0;
for (i = 0; i < count; i++) {
struct libusb_device *dev = list[i];
struct libusb_device_descriptor desc;
int err = libusb_get_device_descriptor(dev, &desc);
if (err != 0) {
msg_perr("Reading the USB device descriptor failed (%s)!\n", libusb_error_name(err));
libusb_free_device_list(list, 1);
return NULL;
}
if ((desc.idVendor == vid) && (desc.idProduct == pid)) {
msg_pdbg("Found USB device %04"PRIx16":%04"PRIx16" at address %d-%d.\n",
desc.idVendor, desc.idProduct,
libusb_get_bus_number(dev), libusb_get_device_address(dev));
if (num == 0) {
err = libusb_open(dev, &handle);
if (err != 0) {
msg_perr("Opening the USB device failed (%s)!\n",
libusb_error_name(err));
libusb_free_device_list(list, 1);
return NULL;
}
break;
}
num--;
}
}
libusb_free_device_list(list, 1);
return handle;
}