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comparison libuwrap/claim_if.c @ 40:f5847be43d35

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fc-duart28-conf: bump off both ttyUSB devices on set operation
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 10 Sep 2023 21:13:58 +0000
parents libuwrap/open_close.c@80e521d6609c
children 5160f6717903
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39:b9ecfa54fe2b 40:f5847be43d35
1 /*
2 * When we are reprogramming the EEPROM on DUART28 or possibly other devices
3 * in the future where we know that we are operating on a multichannel FTDI
4 * chip (or perhaps a multichannel chip from some other vendor), it is most
5 * philosophically correct to bump off ftdi_sio from both interfaces,
6 * removing both ttyUSB devices. Here we implement a function for claiming
7 * one interface, easily callable for multiple interfaces in a row.
8 */
9
10 #include <stdio.h>
11 #include <stdlib.h>
12 #include <usb.h>
13 #include "open_close.h"
14
15 void usbwrap_claim_interface(usb_dev_handle *usbh, int ifnum, int detach)
16 {
17 if (detach)
18 usb_detach_kernel_driver_np(usbh, ifnum);
19 if (usb_claim_interface(usbh, ifnum) != 0) {
20 fprintf(stderr, "error: usb_claim_interface() failed\n");
21 exit(1);
22 }
23 }