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   1 /***************************************************************************
   2  *   Copyright (C) 2018 by Mickaël Thomas                                  *
   3  *   mickael9@gmail.com                                                    *
   4  *                                                                         *
   5  *   Copyright (C) 2016 by Maksym Hilliaka                                 *
   6  *   oter@frozen-team.com                                                  *
   7  *                                                                         *
   8  *   Copyright (C) 2016 by Phillip Pearson                                 *
   9  *   pp@myelin.co.nz                                                       *
  10  *                                                                         *
  11  *   Copyright (C) 2014 by Paul Fertser                                    *
  12  *   fercerpav@gmail.com                                                   *
  13  *                                                                         *
  14  *   Copyright (C) 2013 by mike brown                                      *
  15  *   mike@theshedworks.org.uk                                              *
  16  *                                                                         *
  17  *   Copyright (C) 2013 by Spencer Oliver                                  *
  18  *   spen@spen-soft.co.uk                                                  *
  19  *                                                                         *
  20  *   This program is free software; you can redistribute it and/or modify  *
  21  *   it under the terms of the GNU General Public License as published by  *
  22  *   the Free Software Foundation; either version 2 of the License, or     *
  23  *   (at your option) any later version.                                   *
  24  *                                                                         *
  25  *   This program is distributed in the hope that it will be useful,       *
  26  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  27  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  28  *   GNU General Public License for more details.                          *
  29  *                                                                         *
  30  *   You should have received a copy of the GNU General Public License     *
  31  *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  32  ***************************************************************************/
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include "config.h"
  36 #endif
  37
  38 #include <hidapi.h>
  39 #include <helper/log.h>
  40
  41 #include "cmsis_dap.h"
  42
  43 struct cmsis_dap_backend_data {
  44         hid_device *dev_handle;
  45 };
  46
  47 static void cmsis_dap_hid_close(struct cmsis_dap *dap);
  48 static int cmsis_dap_hid_alloc(struct cmsis_dap *dap, unsigned int pkt_sz);
  49
  50 static int cmsis_dap_hid_open(struct cmsis_dap *dap, uint16_t vids[], uint16_t pids[], char *serial)
  51 {
  52         hid_device *dev = NULL;
  53         int i;
  54         struct hid_device_info *devs, *cur_dev;
  55         unsigned short target_vid, target_pid;
  56
  57         target_vid = 0;
  58         target_pid = 0;
  59
  60         if (hid_init() != 0) {
  61                 LOG_ERROR("unable to open HIDAPI");
  62                 return ERROR_FAIL;
  63         }
  64
  65         /*
  66          * The CMSIS-DAP specification stipulates:
  67          * "The Product String must contain "CMSIS-DAP" somewhere in the string. This is used by the
  68          * debuggers to identify a CMSIS-DAP compliant Debug Unit that is connected to a host computer."
  69          */
  70         devs = hid_enumerate(0x0, 0x0);
  71         cur_dev = devs;
  72         while (NULL != cur_dev) {
  73                 bool found = false;
  74
  75                 if (0 == vids[0]) {
  76                         if (NULL == cur_dev->product_string) {
  77                                 LOG_DEBUG("Cannot read product string of device 0x%x:0x%x",
  78                                           cur_dev->vendor_id, cur_dev->product_id);
  79                         } else if (wcsstr(cur_dev->product_string, L"CMSIS-DAP")) {
  80                                 /* if the user hasn't specified VID:PID *and*
  81                                  * product string contains "CMSIS-DAP", pick it
  82                                  */
  83                                 found = true;
  84                         }
  85                 } else {
  86                         /* otherwise, exhaustively compare against all VID:PID in list */
  87                         for (i = 0; vids[i] || pids[i]; i++) {
  88                                 if ((vids[i] == cur_dev->vendor_id) && (pids[i] == cur_dev->product_id))
  89                                         found = true;
  90                         }
  91                 }
  92
  93                 /* LPC-LINK2 has cmsis-dap on interface 0 and other HID functions on other interfaces */
  94                 if (cur_dev->vendor_id == 0x1fc9 && cur_dev->product_id == 0x0090 && cur_dev->interface_number != 0)
  95                         found = false;
  96
  97                 if (found) {
  98                         /* check serial number matches if given */
  99                         if (serial == NULL)
 100                                 break;
 101
 102                         if (cur_dev->serial_number != NULL) {
 103                                 size_t len = (strlen(serial) + 1) * sizeof(wchar_t);
 104                                 wchar_t *wserial = malloc(len);
 105                                 mbstowcs(wserial, serial, len);
 106
 107                                 if (wcscmp(wserial, cur_dev->serial_number) == 0) {
 108                                         free(wserial);
 109                                         break;
 110                                 } else {
 111                                         free(wserial);
 112                                         wserial = NULL;
 113                                 }
 114                         }
 115                 }
 116
 117                 cur_dev = cur_dev->next;
 118         }
 119
 120         if (NULL != cur_dev) {
 121                 target_vid = cur_dev->vendor_id;
 122                 target_pid = cur_dev->product_id;
 123         }
 124
 125         if (target_vid == 0 && target_pid == 0) {
 126                 hid_free_enumeration(devs);
 127                 return ERROR_FAIL;
 128         }
 129
 130         dap->bdata = malloc(sizeof(struct cmsis_dap_backend_data));
 131         if (dap->bdata == NULL) {
 132                 LOG_ERROR("unable to allocate memory");
 133                 return ERROR_FAIL;
 134         }
 135
 136         dev = hid_open_path(cur_dev->path);
 137         hid_free_enumeration(devs);
 138
 139         if (dev == NULL) {
 140                 LOG_ERROR("unable to open CMSIS-DAP device 0x%x:0x%x", target_vid, target_pid);
 141                 return ERROR_FAIL;
 142         }
 143
 144         /* allocate default packet buffer, may be changed later.
 145          * currently with HIDAPI we have no way of getting the output report length
 146          * without this info we cannot communicate with the adapter.
 147          * For the moment we have to hard code the packet size */
 148
 149         unsigned int packet_size = 64;
 150
 151         /* atmel cmsis-dap uses 512 byte reports */
 152         /* except when it doesn't e.g. with mEDBG on SAMD10 Xplained
 153          * board */
 154         /* TODO: HID report descriptor should be parsed instead of
 155          * hardcoding a match by VID */
 156         if (target_vid == 0x03eb && target_pid != 0x2145 && target_pid != 0x2175)
 157                 packet_size = 512;
 158
 159         dap->bdata->dev_handle = dev;
 160
 161         int retval = cmsis_dap_hid_alloc(dap, packet_size);
 162         if (retval != ERROR_OK) {
 163                 cmsis_dap_hid_close(dap);
 164                 return ERROR_FAIL;
 165         }
 166
 167         return ERROR_OK;
 168 }
 169
 170 static void cmsis_dap_hid_close(struct cmsis_dap *dap)
 171 {
 172         hid_close(dap->bdata->dev_handle);
 173         hid_exit();
 174         free(dap->bdata);
 175         dap->bdata = NULL;
 176         free(dap->packet_buffer);
 177         dap->packet_buffer = NULL;
 178 }
 179
 180 static int cmsis_dap_hid_read(struct cmsis_dap *dap, int timeout_ms)
 181 {
 182         int retval = hid_read_timeout(dap->bdata->dev_handle, dap->packet_buffer, dap->packet_buffer_size, timeout_ms);
 183
 184         if (retval == 0) {
 185                 return ERROR_TIMEOUT_REACHED;
 186         } else if (retval == -1) {
 187                 LOG_ERROR("error reading data: %ls", hid_error(dap->bdata->dev_handle));
 188                 return ERROR_FAIL;
 189         }
 190
 191         return retval;
 192 }
 193
 194 static int cmsis_dap_hid_write(struct cmsis_dap *dap, int txlen, int timeout_ms)
 195 {
 196         (void) timeout_ms;
 197
 198         /* Pad the rest of the TX buffer with 0's */
 199         memset(dap->packet_buffer + txlen, 0, dap->packet_buffer_size - txlen);
 200
 201         /* write data to device */
 202         int retval = hid_write(dap->bdata->dev_handle, dap->packet_buffer, dap->packet_buffer_size);
 203         if (retval == -1) {
 204                 LOG_ERROR("error writing data: %ls", hid_error(dap->bdata->dev_handle));
 205                 return ERROR_FAIL;
 206         }
 207
 208         return retval;
 209 }
 210
 211 static int cmsis_dap_hid_alloc(struct cmsis_dap *dap, unsigned int pkt_sz)
 212 {
 213         unsigned int packet_buffer_size = pkt_sz + REPORT_ID_SIZE;
 214         uint8_t *buf = malloc(packet_buffer_size);
 215         if (buf == NULL) {
 216                 LOG_ERROR("unable to allocate CMSIS-DAP packet buffer");
 217                 return ERROR_FAIL;
 218         }
 219
 220         dap->packet_buffer = buf;
 221         dap->packet_size = pkt_sz;
 222         dap->packet_buffer_size = packet_buffer_size;
 223
 224         return ERROR_OK;
 225 }
 226
 227 const struct cmsis_dap_backend cmsis_dap_hid_backend = {
 228         .name = "hid",
 229         .open = cmsis_dap_hid_open,
 230         .close = cmsis_dap_hid_close,
 231         .read = cmsis_dap_hid_read,
 232         .write = cmsis_dap_hid_write,
 233         .packet_buffer_alloc = cmsis_dap_hid_alloc,
 234 };