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annotate cp2102/find_dev.c @ 101:ba741a1af0e3

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doc/CP2102-EEPROM-tools: article started
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 28 Sep 2023 06:35:39 +0000
parents 1cacc1ae56f0
children
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1 /*
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2 * The function implemented in this module is common to all programs in
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3 * FC CP2102 tools suite that operate on physical hardware: it asks libuwrap
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4 * to locate either the default CP2102 VID:PID or a custom device selector
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5 * string.
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6 */
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7
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8 #include <sys/types.h>
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9 #include <string.h>
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10 #include <strings.h>
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11 #include <stdio.h>
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12 #include <stdlib.h>
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13 #include <unistd.h>
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14 #include <usb.h>
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15 #include "../libuwrap/find_dev.h"
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16
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17 static const struct usbdev_matchspec default_id = {0x10C4, 0xEA60};
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18
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19 struct usb_device *
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20 find_cp2102_device(devsel_arg)
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21 char *devsel_arg;
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22 {
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23 struct usb_device *dev;
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24
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25 if (devsel_arg) {
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26 dev = find_usbdev_by_desc_string(devsel_arg);
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27 if (!dev) {
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28 fprintf(stderr,
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29 "error: specified USB device not found\n");
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30 exit(1);
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31 }
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32 } else {
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33 dev = find_usbdev_by_matchspec(&default_id);
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34 if (!dev) {
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35 fprintf(stderr,
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36 "error: no default-ID CP2102 device found\n");
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37 exit(1);
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38 }
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39 }
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40 return dev;
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41 }