Add ucrcom(4) a (very simple) driver for the serial console of (some)

chromebooks.

ok deraadt@

1 files changed, 136 insertions, 0 deletions

diff --git a/sys/dev/usb/ucrcom.c b/sys/dev/usb/ucrcom.c
new file mode 100644
index 00000000000..4136a4752bd
--- /dev/null
+++ b/sys/dev/usb/ucrcom.c
@@ -0,0 +1,136 @@
+/*	$OpenBSD: ucrcom.c,v 1.1 2019/05/08 23:53:40 kettenis Exp $	*/
+
+/*
+ * Copyright (c) 2019 Mark Kettenis <kettenis@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/kernel.h>
+#include <sys/tty.h>
+#include <sys/device.h>
+
+#include <dev/usb/usb.h>
+#include <dev/usb/usbdi.h>
+#include <dev/usb/usbdi_util.h>
+#include <dev/usb/usbdevs.h>
+
+#include <dev/usb/ucomvar.h>
+
+#define UCRCOMBUFSZ		64
+
+struct ucrcom_softc {
+	struct device		sc_dev;
+	struct device		*sc_subdev;
+};
+
+struct ucom_methods ucrcom_methods = { NULL };
+
+int ucrcom_match(struct device *, void *, void *);
+void ucrcom_attach(struct device *, struct device *, void *);
+int ucrcom_detach(struct device *, int);
+
+struct cfdriver ucrcom_cd = {
+	NULL, "ucrcom", DV_DULL
+};
+
+const struct cfattach ucrcom_ca = {
+	sizeof(struct ucrcom_softc), ucrcom_match, ucrcom_attach, ucrcom_detach
+};
+
+int
+ucrcom_match(struct device *parent, void *match, void *aux)
+{
+	struct usb_attach_arg *uaa = aux;
+	usb_interface_descriptor_t *id;
+	usb_device_descriptor_t *dd;
+
+	if (uaa->iface == NULL)
+		return UMATCH_NONE;
+
+	id = usbd_get_interface_descriptor(uaa->iface);
+	dd = usbd_get_device_descriptor(uaa->device);
+	if (id == NULL || dd == NULL)
+		return UMATCH_NONE;
+
+	if (UGETW(dd->idVendor) == USB_VENDOR_GOOGLE &&
+	    id->bInterfaceClass == UICLASS_VENDOR &&
+	    id->bInterfaceSubClass == 0x50 &&
+	    id->bInterfaceProtocol == 1)
+		return UMATCH_VENDOR_IFACESUBCLASS_IFACEPROTO;
+
+	return UMATCH_NONE;
+}
+
+void
+ucrcom_attach(struct device *parent, struct device *self, void *aux)
+{
+	struct ucrcom_softc *sc = (struct ucrcom_softc *)self;
+	struct usb_attach_arg *uaa = aux;
+	struct ucom_attach_args uca;
+	usb_interface_descriptor_t *id;
+	usb_endpoint_descriptor_t *ed;
+	int i;
+
+	id = usbd_get_interface_descriptor(uaa->iface);
+
+	memset(&uca, 0, sizeof(uca));
+	uca.bulkin = uca.bulkout = -1;
+	for (i = 0; i < id->bNumEndpoints; i++) {
+		ed = usbd_interface2endpoint_descriptor(uaa->iface, i);
+		if (ed == NULL) {
+			printf("%s: no endpoint descriptor for %d\n",
+				sc->sc_dev.dv_xname, i);
+			usbd_deactivate(uaa->device);
+			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(uaa->device);
+		return;
+	}
+
+	uca.ibufsize = UCRCOMBUFSZ;
+	uca.ibufsizepad = UCRCOMBUFSZ;
+	uca.obufsize = UCRCOMBUFSZ;
+	uca.opkthdrlen = 0;
+	uca.device = uaa->device;
+	uca.iface = uaa->iface;
+	uca.methods = &ucrcom_methods;
+	uca.arg = sc;
+
+	sc->sc_subdev = config_found_sm(self, &uca, ucomprint, ucomsubmatch);
+}
+
+int
+ucrcom_detach(struct device *self, int flags)
+{
+	struct ucrcom_softc *sc = (struct ucrcom_softc *)self;
+	int rv = 0;
+
+	if (sc->sc_subdev != NULL)
+		rv = config_detach(sc->sc_subdev, flags);
+
+	return rv;
+}