xref: /openbsd-src/sys/dev/usb/uscom.c (revision 81508fe356eb7772a68118f65f91723ce5261d7d)

/*	$OpenBSD: uscom.c,v 1.9 2024/05/23 03:21:09 jsg Exp $	*/

/*
 * Copyright (c) 2006 Jonathan Gray <jsg@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/tty.h>
#include <sys/device.h>

#include <dev/usb/usb.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usbdevs.h>

#include <dev/usb/ucomvar.h>

#define USCOMBUFSZ		256
#define USCOM_IFACE_NO		0

struct uscom_softc {
	struct device		 sc_dev;
	struct usbd_device	*sc_udev;
	struct usbd_interface	*sc_iface;
	struct device		*sc_subdev;
};

const struct ucom_methods uscom_methods = {
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
};

static const struct usb_devno uscom_devs[] = {
	{ USB_VENDOR_HP,		USB_PRODUCT_HP_HPX9GP },
	{ USB_VENDOR_DYNASTREAM,	USB_PRODUCT_DYNASTREAM_ANTUSB2 },
	{ USB_VENDOR_DYNASTREAM,	USB_PRODUCT_DYNASTREAM_ANTUSBM }
};

int	 uscom_match(struct device *, void *, void *);
void	 uscom_attach(struct device *, struct device *, void *);
int	 uscom_detach(struct device *, int);

struct cfdriver uscom_cd = {
	NULL, "uscom", DV_DULL
};

const struct cfattach uscom_ca = {
	sizeof(struct uscom_softc), uscom_match, uscom_attach, uscom_detach
};

int
uscom_match(struct device *parent, void *match, void *aux)
{
	struct usb_attach_arg *uaa = aux;

	if (uaa->iface == NULL)
		return UMATCH_NONE;

	return (usb_lookup(uscom_devs, uaa->vendor, uaa->product) != NULL) ?
	    UMATCH_VENDOR_PRODUCT : UMATCH_NONE;
}

void
uscom_attach(struct device *parent, struct device *self, void *aux)
{
	struct uscom_softc *sc = (struct uscom_softc *)self;
	struct usb_attach_arg *uaa = aux;
	struct ucom_attach_args uca;
	usb_interface_descriptor_t *id;
	usb_endpoint_descriptor_t *ed;
	usbd_status error;
	int i;

	bzero(&uca, sizeof(uca));
	sc->sc_udev = uaa->device;

	/* get the first interface handle */
	error = usbd_device2interface_handle(sc->sc_udev, USCOM_IFACE_NO,
	    &sc->sc_iface);
	if (error != 0) {
		printf("%s: could not get interface handle\n",
		    sc->sc_dev.dv_xname);
		usbd_deactivate(sc->sc_udev);
		return;
	}

	id = usbd_get_interface_descriptor(sc->sc_iface);

	uca.bulkin = uca.bulkout = -1;
	for (i = 0; i < id->bNumEndpoints; i++) {
		ed = usbd_interface2endpoint_descriptor(sc->sc_iface, i);
		if (ed == NULL) {
			printf("%s: no endpoint descriptor found for %d\n",
			    sc->sc_dev.dv_xname, i);
			usbd_deactivate(sc->sc_udev);
			return;
		}

		if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
		    UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK)
			uca.bulkin = ed->bEndpointAddress;
		else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT &&
		    UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK)
			uca.bulkout = ed->bEndpointAddress;
	}

	if (uca.bulkin == -1 || uca.bulkout == -1) {
		printf("%s: missing endpoint\n", sc->sc_dev.dv_xname);
		usbd_deactivate(sc->sc_udev);
		return;
	}

	uca.ibufsize = USCOMBUFSZ;
	uca.obufsize = USCOMBUFSZ;
	uca.ibufsizepad = USCOMBUFSZ;
	uca.opkthdrlen = 0;
	uca.device = sc->sc_udev;
	uca.iface = sc->sc_iface;
	uca.methods = &uscom_methods;
	uca.arg = sc;
	uca.info = NULL;

	sc->sc_subdev = config_found_sm(self, &uca, ucomprint, ucomsubmatch);
}

int
uscom_detach(struct device *self, int flags)
{
	struct uscom_softc *sc = (struct uscom_softc *)self;
	int rv = 0;

	if (sc->sc_subdev != NULL) {
		rv = config_detach(sc->sc_subdev, flags);
		sc->sc_subdev = NULL;
	}

	return (rv);
}