FreeCalypso > hg > fc-usbser-tools

annotate duart28/find_usb.c @ 67:742c41f44658

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doc/FTDI-chip-ID: new article
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 13 Sep 2023 00:43:14 +0000
parents b9ecfa54fe2b
children
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1 /*
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2 * This module implements the step of locating a connected FreeCalypso DUART28
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3 * device (either C or S) at the libusb level, without booting off the kernel
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4 * driver and claiming the interface yet.
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5 */
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6
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <string.h>
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10 #include <strings.h>
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11 #include <usb.h>
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12 #include "../libuwrap/prelim_init.h"
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13
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14 unsigned usb_presenting_pid;
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15
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16 static void
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17 get_string(usb_dev_handle *usbh, int index, char *buf, size_t buflen)
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18 {
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19 int rc;
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20
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21 rc = usb_get_string_simple(usbh, index, buf, buflen);
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22 if (rc <= 0) {
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23 fprintf(stderr, "error: USB string retrieval failed\n");
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24 exit(1);
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25 }
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26 }
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28 static int
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29 is_match(struct usb_device *dev)
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30 {
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31 struct usb_device_descriptor *desc = &dev->descriptor;
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32 usb_dev_handle *usbh;
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33 char strbuf[1024];
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34
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35 if (desc->idVendor != 0x0403)
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36 return 0;
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37 if (desc->idProduct != 0x6010 && desc->idProduct != 0x7152)
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38 return 0;
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39 usbh = usb_open(dev);
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40 if (!usbh) {
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41 fprintf(stderr, "error: usb_open() failed\n");
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42 exit(1);
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43 }
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44 get_string(usbh, desc->iManufacturer, strbuf, sizeof strbuf);
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45 if (strcmp(strbuf, "FreeCalypso")) {
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46 usb_close(usbh);
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47 return 0;
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48 }
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49 get_string(usbh, desc->iProduct, strbuf, sizeof strbuf);
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50 if (strcmp(strbuf, "DUART28C") && strcmp(strbuf, "DUART28S")) {
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51 usb_close(usbh);
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52 return 0;
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53 }
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54 usb_close(usbh);
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55 printf("Found FreeCalypso DUART28 adapter at bus %s device %s\n",
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56 dev->bus->dirname, dev->filename);
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57 usb_presenting_pid = desc->idProduct;
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58 return 1;
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59 }
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60
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61 struct usb_device *
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62 find_duart28_usbdev()
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63 {
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64 struct usb_bus *bus;
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65 struct usb_device *dev;
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66
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67 libusb_prelim_init();
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68 for (bus = usb_get_busses(); bus; bus = bus->next) {
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69 for (dev = bus->devices; dev; dev = dev->next) {
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70 if (is_match(dev))
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71 return dev;
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72 }
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73 }
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74 return 0;
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75 }