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Add code to setup hardware or software flow control (or none at

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all, if necessary) depending on the user-specified termios flags.

This allows the device to talk to DCEs which don't assert RTS
(i.e. dumb, 3-wire serial ports).
This commit is contained in:
scw 2002-07-18 14:44:10 +00:00
parent cd3752a0a3
commit 0096beb078
1 changed files with 21 additions and 3 deletions
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24
sys/dev/usb/uftdi.c
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@ -1,4 +1,4 @@
/* $NetBSD: uftdi.c,v 1.11 2002/07/11 21:14:27 augustss Exp $ */
/* $NetBSD: uftdi.c,v 1.12 2002/07/18 14:44:10 scw Exp $ */
/*
* Copyright (c) 2000 The NetBSD Foundation, Inc.
@ -46,7 +46,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uftdi.c,v 1.11 2002/07/11 21:14:27 augustss Exp $");
__KERNEL_RCSID(0, "$NetBSD: uftdi.c,v 1.12 2002/07/18 14:44:10 scw Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -426,7 +426,7 @@ uftdi_param(void *vsc, int portno, struct termios *t)
struct uftdi_softc *sc = vsc;
usb_device_request_t req;
usbd_status err;
int rate, data;
int rate, data, flow;
DPRINTF(("uftdi_param: sc=%p\n", sc));
@ -522,6 +522,24 @@ uftdi_param(void *vsc, int portno, struct termios *t)
if (err)
return (EIO);
if (ISSET(t->c_cflag, CRTSCTS)) {
flow = FTDI_SIO_RTS_CTS_HS;
USETW(req.wValue, 0);
} else if (ISSET(t->c_iflag, IXON|IXOFF)) {
flow = FTDI_SIO_XON_XOFF_HS;
USETW2(req.wValue, t->c_cc[VSTOP], t->c_cc[VSTART]);
} else {
flow = FTDI_SIO_DISABLE_FLOW_CTRL;
USETW(req.wValue, 0);
}
req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
req.bRequest = FTDI_SIO_SET_FLOW_CTRL;
USETW2(req.wIndex, flow, portno);
USETW(req.wLength, 0);
err = usbd_do_request(sc->sc_udev, &req, NULL);
if (err)
return (EIO);
return (0);
}