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annotate libuwrap/claim_if.c @ 43:dbaf239436cf

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doc/DUART28-EEPROM-config: update for fc-duart28-conf
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 11 Sep 2023 01:06:03 +0000
parents f5847be43d35
children 5160f6717903
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80e521d6609c libuwrap: implement USB device open and close
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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f5847be43d35 fc-duart28-conf: bump off both ttyUSB devices on set operation
Mychaela Falconia <falcon@freecalypso.org>
parents: 12
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2 * When we are reprogramming the EEPROM on DUART28 or possibly other devices
f5847be43d35 fc-duart28-conf: bump off both ttyUSB devices on set operation
Mychaela Falconia <falcon@freecalypso.org>
parents: 12
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3 * in the future where we know that we are operating on a multichannel FTDI
f5847be43d35 fc-duart28-conf: bump off both ttyUSB devices on set operation
Mychaela Falconia <falcon@freecalypso.org>
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4 * chip (or perhaps a multichannel chip from some other vendor), it is most
f5847be43d35 fc-duart28-conf: bump off both ttyUSB devices on set operation
Mychaela Falconia <falcon@freecalypso.org>
parents: 12
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5 * philosophically correct to bump off ftdi_sio from both interfaces,
f5847be43d35 fc-duart28-conf: bump off both ttyUSB devices on set operation
Mychaela Falconia <falcon@freecalypso.org>
parents: 12
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6 * removing both ttyUSB devices. Here we implement a function for claiming
f5847be43d35 fc-duart28-conf: bump off both ttyUSB devices on set operation
Mychaela Falconia <falcon@freecalypso.org>
parents: 12
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7 * one interface, easily callable for multiple interfaces in a row.
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80e521d6609c libuwrap: implement USB device open and close
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8 */
80e521d6609c libuwrap: implement USB device open and close
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80e521d6609c libuwrap: implement USB device open and close
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10 #include <stdio.h>
80e521d6609c libuwrap: implement USB device open and close
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11 #include <stdlib.h>
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12 #include <usb.h>
80e521d6609c libuwrap: implement USB device open and close
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13 #include "open_close.h"
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15 void usbwrap_claim_interface(usb_dev_handle *usbh, int ifnum, int detach)
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16 {
80e521d6609c libuwrap: implement USB device open and close
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17 if (detach)
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18 usb_detach_kernel_driver_np(usbh, ifnum);
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19 if (usb_claim_interface(usbh, ifnum) != 0) {
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20 fprintf(stderr, "error: usb_claim_interface() failed\n");
80e521d6609c libuwrap: implement USB device open and close
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21 exit(1);
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22 }
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23 }