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annotate libuwrap/claim_if.c @ 88:ea7b411aad27

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cp2102-decode-ee-desc: decode interface descriptor
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 27 Sep 2023 19:39:44 +0000
parents 5cbde3c80c24
children
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80e521d6609c libuwrap: implement USB device open and close
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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 }