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annotate libuwrap/claim_if.c @ 68:5cbde3c80c24

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fteeprom-{erase,prog}: detach logic: change to detach by default As it turns out, detaching all ttyUSB interfaces of a multichannel device does not require outside knowledge of how many channels there are, as in our previous -d option design that is being removed here - instead we can read the bNumInterfaces constant from the USB device's config descriptor and thus know how many interfaces there are in total. Based on this discovery, change the design of fteeprom-{erase,prog} as follows: * remove -d option; * flip the default to where we detach all interfaces by default; * add -n option to NOT detach any interfaces.
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 13 Sep 2023 06:37:03 +0000
parents 5160f6717903
children
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1 /*
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2 * The operation of programming an FTDI EEPROM *can* be done without ever
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3 * claiming any of the chip's interfaces and without unbinding ttyUSB from
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4 * any channel, even if we are doing the special magic sequence for FT232R.
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5 * However, given the identity-altering nature of EEPROM programming it is
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6 * generally a good idea to claim all interfaces and unbind all ttyUSB
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7 * devices, and in the case of FT232R the magic sequence breaks normal
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8 * UART operation.
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9 *
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10 * This library module provides building block functions: a function for
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11 * claiming one interface and a higher-level function claiming all interfaces
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12 * of a multichannel device.
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13 */
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15 #include <stdio.h>
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16 #include <stdlib.h>
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17 #include <usb.h>
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18 #include "open_close.h"
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20 void usbwrap_claim_interface(usb_dev_handle *usbh, int ifnum, int detach)
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21 {
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22 if (detach)
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23 usb_detach_kernel_driver_np(usbh, ifnum);
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24 if (usb_claim_interface(usbh, ifnum) != 0) {
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25 fprintf(stderr, "error: usb_claim_interface() failed\n");
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26 exit(1);
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27 }
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28 }
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30 void usbwrap_claim_all_ifs(usb_dev_handle *usbh)
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31 {
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32 struct usb_device *dev = usb_device(usbh);
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33 unsigned numint = dev->config->bNumInterfaces;
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34 unsigned n;
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35
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36 for (n = 0; n < numint; n++)
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37 usbwrap_claim_interface(usbh, n, 1);
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38 }