251 lines
7.5 KiB
C
251 lines
7.5 KiB
C
/***************************************************************************
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* Copyright (C) 2009 by Zachary T Welch <zw@superlucidity.net> *
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* *
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* Copyright (C) 2011 by Mauro Gamba <maurillo71@gmail.com> *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
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***************************************************************************/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "log.h"
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#include "libusb1_common.h"
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static struct libusb_context *jtag_libusb_context; /**< Libusb context **/
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static libusb_device **devs; /**< The usb device list **/
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static bool jtag_libusb_match(struct libusb_device_descriptor *dev_desc,
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const uint16_t vids[], const uint16_t pids[])
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{
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for (unsigned i = 0; vids[i]; i++) {
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if (dev_desc->idVendor == vids[i] &&
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dev_desc->idProduct == pids[i]) {
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return true;
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}
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}
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return false;
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}
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/* Returns true if the string descriptor indexed by str_index in device matches string */
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static bool string_descriptor_equal(libusb_device_handle *device, uint8_t str_index,
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const char *string)
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{
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int retval;
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bool matched;
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char desc_string[256+1]; /* Max size of string descriptor */
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if (str_index == 0)
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return false;
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retval = libusb_get_string_descriptor_ascii(device, str_index,
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(unsigned char *)desc_string, sizeof(desc_string)-1);
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if (retval < 0) {
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LOG_ERROR("libusb_get_string_descriptor_ascii() failed with %d", retval);
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return false;
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}
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/* Null terminate descriptor string in case it needs to be logged. */
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desc_string[sizeof(desc_string)-1] = '\0';
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matched = strncmp(string, desc_string, sizeof(desc_string)) == 0;
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if (!matched)
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LOG_DEBUG("Device serial number '%s' doesn't match requested serial '%s'",
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desc_string, string);
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return matched;
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}
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int jtag_libusb_open(const uint16_t vids[], const uint16_t pids[],
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const char *serial,
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struct jtag_libusb_device_handle **out)
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{
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int cnt, idx, errCode;
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int retval = -ENODEV;
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struct jtag_libusb_device_handle *libusb_handle = NULL;
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if (libusb_init(&jtag_libusb_context) < 0)
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return -ENODEV;
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cnt = libusb_get_device_list(jtag_libusb_context, &devs);
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for (idx = 0; idx < cnt; idx++) {
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struct libusb_device_descriptor dev_desc;
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if (libusb_get_device_descriptor(devs[idx], &dev_desc) != 0)
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continue;
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if (!jtag_libusb_match(&dev_desc, vids, pids))
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continue;
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errCode = libusb_open(devs[idx], &libusb_handle);
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if (errCode) {
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LOG_ERROR("libusb_open() failed with %s",
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libusb_error_name(errCode));
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continue;
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}
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/* Device must be open to use libusb_get_string_descriptor_ascii. */
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if (serial != NULL &&
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!string_descriptor_equal(libusb_handle, dev_desc.iSerialNumber, serial)) {
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libusb_close(libusb_handle);
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continue;
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}
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/* Success. */
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*out = libusb_handle;
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retval = 0;
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break;
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}
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if (cnt >= 0)
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libusb_free_device_list(devs, 1);
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return retval;
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}
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void jtag_libusb_close(jtag_libusb_device_handle *dev)
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{
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/* Close device */
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libusb_close(dev);
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libusb_exit(jtag_libusb_context);
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}
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int jtag_libusb_control_transfer(jtag_libusb_device_handle *dev, uint8_t requestType,
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uint8_t request, uint16_t wValue, uint16_t wIndex, char *bytes,
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uint16_t size, unsigned int timeout)
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{
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int transferred = 0;
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transferred = libusb_control_transfer(dev, requestType, request, wValue, wIndex,
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(unsigned char *)bytes, size, timeout);
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if (transferred < 0)
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transferred = 0;
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return transferred;
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}
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int jtag_libusb_bulk_write(jtag_libusb_device_handle *dev, int ep, char *bytes,
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int size, int timeout)
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{
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int transferred = 0;
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libusb_bulk_transfer(dev, ep, (unsigned char *)bytes, size,
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&transferred, timeout);
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return transferred;
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}
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int jtag_libusb_bulk_read(jtag_libusb_device_handle *dev, int ep, char *bytes,
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int size, int timeout)
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{
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int transferred = 0;
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libusb_bulk_transfer(dev, ep, (unsigned char *)bytes, size,
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&transferred, timeout);
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return transferred;
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}
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int jtag_libusb_set_configuration(jtag_libusb_device_handle *devh,
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int configuration)
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{
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struct jtag_libusb_device *udev = jtag_libusb_get_device(devh);
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int retCode = -99;
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struct libusb_config_descriptor *config = NULL;
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int current_config = -1;
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retCode = libusb_get_configuration(devh, ¤t_config);
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if (retCode != 0)
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return retCode;
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retCode = libusb_get_config_descriptor(udev, configuration, &config);
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if (retCode != 0 || config == NULL)
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return retCode;
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/* Only change the configuration if it is not already set to the
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same one. Otherwise this issues a lightweight reset and hangs
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LPC-Link2 with JLink firmware. */
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if (current_config != config->bConfigurationValue)
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retCode = libusb_set_configuration(devh, config->bConfigurationValue);
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libusb_free_config_descriptor(config);
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return retCode;
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}
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int jtag_libusb_choose_interface(struct jtag_libusb_device_handle *devh,
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unsigned int *usb_read_ep,
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unsigned int *usb_write_ep,
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int bclass, int subclass, int protocol)
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{
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struct jtag_libusb_device *udev = jtag_libusb_get_device(devh);
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const struct libusb_interface *inter;
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const struct libusb_interface_descriptor *interdesc;
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const struct libusb_endpoint_descriptor *epdesc;
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struct libusb_config_descriptor *config;
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*usb_read_ep = *usb_write_ep = 0;
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libusb_get_config_descriptor(udev, 0, &config);
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for (int i = 0; i < (int)config->bNumInterfaces; i++) {
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inter = &config->interface[i];
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interdesc = &inter->altsetting[0];
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for (int k = 0;
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k < (int)interdesc->bNumEndpoints; k++) {
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if ((bclass > 0 && interdesc->bInterfaceClass != bclass) ||
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(subclass > 0 && interdesc->bInterfaceSubClass != subclass) ||
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(protocol > 0 && interdesc->bInterfaceProtocol != protocol))
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continue;
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epdesc = &interdesc->endpoint[k];
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uint8_t epnum = epdesc->bEndpointAddress;
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bool is_input = epnum & 0x80;
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LOG_DEBUG("usb ep %s %02x",
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is_input ? "in" : "out", epnum);
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if (is_input)
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*usb_read_ep = epnum;
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else
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*usb_write_ep = epnum;
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if (*usb_read_ep && *usb_write_ep) {
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LOG_DEBUG("Claiming interface %d", (int)interdesc->bInterfaceNumber);
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libusb_claim_interface(devh, (int)interdesc->bInterfaceNumber);
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libusb_free_config_descriptor(config);
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return ERROR_OK;
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}
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}
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}
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libusb_free_config_descriptor(config);
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return ERROR_FAIL;
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}
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int jtag_libusb_get_pid(struct jtag_libusb_device *dev, uint16_t *pid)
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{
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struct libusb_device_descriptor dev_desc;
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if (libusb_get_device_descriptor(dev, &dev_desc) == 0) {
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*pid = dev_desc.idProduct;
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return ERROR_OK;
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}
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return ERROR_FAIL;
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}
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