FreeCalypso > hg > fc-usbser-tools

comparison duart28/find_usb.c @ 27:2413a54a1bfc

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fc-duart28-conf started
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 09 Sep 2023 17:53:21 +0000
parents
children b9ecfa54fe2b
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26:49239efbdcc8 27:2413a54a1bfc
1 /*
2 * This module implements the step of locating a connected FreeCalypso DUART28
3 * device (either C or S) at the libusb level, without booting off the kernel
4 * driver and claiming the interface yet.
5 */
6
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <string.h>
10 #include <strings.h>
11 #include <usb.h>
12 #include "../libuwrap/prelim_init.h"
13
14 static void
15 get_string(usb_dev_handle *usbh, int index, char *buf, size_t buflen)
16 {
17 int rc;
18
19 rc = usb_get_string_simple(usbh, index, buf, buflen);
20 if (rc <= 0) {
21 fprintf(stderr, "error: USB string retrieval failed\n");
22 exit(1);
23 }
24 }
25
26 static void
27 report_found_dev(struct usb_device *dev, unsigned usb_pid, char string_letter)
28 {
29 printf("Found FreeCalypso DUART28 adapter at bus %s device %s,\n",
30 dev->bus->dirname, dev->filename);
31 if (usb_pid == 0x7152 && string_letter == 'C')
32 printf("presenting as DUART28C\n");
33 else if (usb_pid == 0x6010 && string_letter == 'S')
34 printf("presenting as DUART28S\n");
35 else
36 printf("presenting with inconsistent ID!\n");
37 }
38
39 static int
40 is_match(struct usb_device *dev)
41 {
42 struct usb_device_descriptor *desc = &dev->descriptor;
43 usb_dev_handle *usbh;
44 char strbuf[1024];
45
46 if (desc->idVendor != 0x0403)
47 return 0;
48 if (desc->idProduct != 0x6010 && desc->idProduct != 0x7152)
49 return 0;
50 usbh = usb_open(dev);
51 if (!usbh) {
52 fprintf(stderr, "error: usb_open() failed\n");
53 exit(1);
54 }
55 get_string(usbh, desc->iManufacturer, strbuf, sizeof strbuf);
56 if (strcmp(strbuf, "FreeCalypso")) {
57 usb_close(usbh);
58 return 0;
59 }
60 get_string(usbh, desc->iProduct, strbuf, sizeof strbuf);
61 if (strcmp(strbuf, "DUART28C") && strcmp(strbuf, "DUART28S")) {
62 usb_close(usbh);
63 return 0;
64 }
65 usb_close(usbh);
66 report_found_dev(dev, desc->idProduct, strbuf[7]);
67 return 1;
68 }
69
70 struct usb_device *
71 find_duart28_usbdev()
72 {
73 struct usb_bus *bus;
74 struct usb_device *dev;
75
76 libusb_prelim_init();
77 for (bus = usb_get_busses(); bus; bus = bus->next) {
78 for (dev = bus->devices; dev; dev = dev->next) {
79 if (is_match(dev))
80 return dev;
81 }
82 }
83 return 0;
84 }