FreeCalypso > hg > fc-usbser-tools

annotate libuwrap/find_matchspec.c @ 107:bc3367755586 default tip

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add INSTALL document
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 21 Nov 2023 22:11:09 +0000
parents ab506f6aa57c
children
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9
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1 /*
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2 * In this module we implement the function that locates a USB device
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3 * by matchspec structure: looking for specific VID/PID, possibly qualified
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4 * by strings and/or index.
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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 "find_dev.h"
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13 #include "prelim_init.h"
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14
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15 static void
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16 get_string(usb_dev_handle *usbh, int index, char *buf, size_t buflen)
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17 {
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18 int rc;
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19
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20 rc = usb_get_string_simple(usbh, index, buf, buflen);
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21 if (rc <= 0) {
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22 fprintf(stderr, "error: USB string retrieval failed\n");
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23 exit(1);
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24 }
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25 }
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26
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27 static int
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28 is_match(struct usb_device *dev, const struct usbdev_matchspec *match)
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29 {
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30 struct usb_device_descriptor *desc = &dev->descriptor;
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31 usb_dev_handle *usbh;
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32 char strbuf[1024];
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33
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34 if (desc->idVendor != match->usb_vid)
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35 return 0;
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36 if (desc->idProduct != match->usb_pid)
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37 return 0;
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38 if (match->manuf_string || match->product_string || match->serial) {
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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 if (match->manuf_string) {
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45 get_string(usbh, desc->iManufacturer,
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46 strbuf, sizeof strbuf);
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47 if (strncmp(match->manuf_string,
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48 strbuf, sizeof strbuf)) {
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49 usb_close(usbh);
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50 return 0;
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51 }
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52 }
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53 if (match->product_string) {
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54 get_string(usbh, desc->iProduct, strbuf, sizeof strbuf);
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55 if (strncmp(match->product_string,
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56 strbuf, sizeof strbuf)) {
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57 usb_close(usbh);
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58 return 0;
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59 }
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60 }
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61 if (match->serial) {
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62 get_string(usbh, desc->iSerialNumber,
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63 strbuf, sizeof strbuf);
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64 if (strncmp(match->serial, strbuf, sizeof strbuf)) {
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65 usb_close(usbh);
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66 return 0;
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67 }
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68 }
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69 usb_close(usbh);
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70 }
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71 return 1;
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72 }
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73
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74 struct usb_device *
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75 find_usbdev_by_matchspec(const struct usbdev_matchspec *match)
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76 {
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77 struct usb_bus *bus;
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78 struct usb_device *dev;
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79 unsigned index = match->index;
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80
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81 libusb_prelim_init();
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82 for (bus = usb_get_busses(); bus; bus = bus->next) {
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83 for (dev = bus->devices; dev; dev = dev->next) {
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84 if (is_match(dev, match)) {
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85 if (!index)
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86 return dev;
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87 index--;
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88 }
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89 }
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90 }
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91 return 0;
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92 }