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comparison libuwrap/claim_if.c @ 44:5160f6717903

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libuwrap: implement function to claim/unbind all interfaces
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 11 Sep 2023 02:27:11 +0000
parents f5847be43d35
children 5cbde3c80c24
comparison
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43:dbaf239436cf 44:5160f6717903
1 /* 1 /*
2 * When we are reprogramming the EEPROM on DUART28 or possibly other devices 2 * The operation of programming an FTDI EEPROM *can* be done without ever
3 * in the future where we know that we are operating on a multichannel FTDI 3 * claiming any of the chip's interfaces and without unbinding ttyUSB from
4 * chip (or perhaps a multichannel chip from some other vendor), it is most 4 * any channel, even if we are doing the special magic sequence for FT232R.
5 * philosophically correct to bump off ftdi_sio from both interfaces, 5 * However, given the identity-altering nature of EEPROM programming it is
6 * removing both ttyUSB devices. Here we implement a function for claiming 6 * generally a good idea to claim all interfaces and unbind all ttyUSB
7 * one interface, easily callable for multiple interfaces in a row. 7 * devices, and in the case of FT232R the magic sequence breaks normal
8 * UART operation.
9 *
10 * This library module provides building block functions: a function for
11 * claiming one interface and a higher-level function claiming all interfaces
12 * of a multichannel device.
8 */ 13 */
9 14
10 #include <stdio.h> 15 #include <stdio.h>
11 #include <stdlib.h> 16 #include <stdlib.h>
12 #include <usb.h> 17 #include <usb.h>
19 if (usb_claim_interface(usbh, ifnum) != 0) { 24 if (usb_claim_interface(usbh, ifnum) != 0) {
20 fprintf(stderr, "error: usb_claim_interface() failed\n"); 25 fprintf(stderr, "error: usb_claim_interface() failed\n");
21 exit(1); 26 exit(1);
22 } 27 }
23 } 28 }
29
30 void usbwrap_claim_all_ifs(usb_dev_handle *usbh, unsigned nchannels)
31 {
32 unsigned n;
33
34 for (n = 0; n < nchannels; n++)
35 usbwrap_claim_interface(usbh, n, 1);
36 }