Move viocon.c to sys/dev/pv/viocon.c

virtio itself is not PCI, it is a paravirtual bus on top of either PCI
or MMIO (arm).  This is the second step of moving the virtio files to
dev/pv.  No functional change.

Moving the file is done by removing and adding it again - the old
history can be found in the Attic of sys/dev/pci/viocon.c.

no objections from sf@ mlarkin@

1 files changed, 616 insertions, 0 deletions

diff --git a/sys/dev/pv/viocon.c b/sys/dev/pv/viocon.c
new file mode 100644
index 00000000000..d573ae2736a
--- /dev/null
+++ b/sys/dev/pv/viocon.c
@@ -0,0 +1,616 @@
+/*	$OpenBSD: viocon.c,v 1.1 2017/01/21 11:22:38 reyk Exp $	*/
+
+/*
+ * Copyright (c) 2013-2015 Stefan Fritsch <sf@sfritsch.de>
+ *
+ * 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/timeout.h>
+#include <machine/bus.h>
+#include <sys/device.h>
+#include <sys/conf.h>
+#include <sys/tty.h>
+#include <dev/pci/pcivar.h>
+#include <dev/pv/virtioreg.h>
+#include <dev/pv/virtiovar.h>
+
+
+/* features */
+#define	VIRTIO_CONSOLE_F_SIZE		(1<<0)
+#define	VIRTIO_CONSOLE_F_MULTIPORT	(1<<1)
+#define	VIRTIO_CONSOLE_F_EMERG_WRITE 	(1<<2)
+
+/* config space */
+#define VIRTIO_CONSOLE_COLS		0	/* 16 bits */
+#define VIRTIO_CONSOLE_ROWS		2	/* 16 bits */
+#define VIRTIO_CONSOLE_MAX_NR_PORTS	4	/* 32 bits */
+#define VIRTIO_CONSOLE_EMERG_WR		8	/* 32 bits */
+
+#define VIOCON_DEBUG	0
+
+#if VIOCON_DEBUG
+#define DBGPRINT(fmt, args...) printf("%s: " fmt "\n", __func__, ## args)
+#else
+#define DBGPRINT(fmt, args...)
+#endif
+
+struct virtio_feature_name viocon_feature_names[] = {
+	{ VIRTIO_CONSOLE_F_SIZE,	"Size" },
+	{ VIRTIO_CONSOLE_F_MULTIPORT,	"MultiPort" },
+	{ VIRTIO_CONSOLE_F_EMERG_WRITE,	"EmergWrite" },
+	{ 0, 				NULL },
+};
+
+struct virtio_console_control {
+	uint32_t id;	/* Port number */
+
+#define	VIRTIO_CONSOLE_DEVICE_READY	0
+#define	VIRTIO_CONSOLE_PORT_ADD		1
+#define	VIRTIO_CONSOLE_PORT_REMOVE	2
+#define	VIRTIO_CONSOLE_PORT_READY	3
+#define	VIRTIO_CONSOLE_CONSOLE_PORT	4
+#define	VIRTIO_CONSOLE_RESIZE		5
+#define	VIRTIO_CONSOLE_PORT_OPEN	6
+#define	VIRTIO_CONSOLE_PORT_NAME	7
+	uint16_t event;
+
+	uint16_t value;
+};
+
+struct virtio_console_control_resize {
+	/* yes, the order is different than in config space */
+	uint16_t rows;
+	uint16_t cols;
+};
+
+#define	BUFSIZE		128
+CTASSERT(BUFSIZE < TTHIWATMINSPACE);
+
+#define VIOCONUNIT(x)	(minor(x) >> 4)
+#define VIOCONPORT(x)	(minor(x) & 0x0f)
+
+struct viocon_port {
+	struct viocon_softc	*vp_sc;
+	struct virtqueue	*vp_rx;
+	struct virtqueue	*vp_tx;
+	void			*vp_si;
+	struct tty		*vp_tty;
+	const char 		*vp_name;
+	bus_dma_segment_t	 vp_dmaseg;
+	bus_dmamap_t		 vp_dmamap;
+#ifdef NOTYET
+	unsigned int		 vp_host_open:1;	/* XXX needs F_MULTIPORT */
+	unsigned int		 vp_guest_open:1;	/* XXX needs F_MULTIPORT */
+	unsigned int		 vp_is_console:1;	/* XXX needs F_MULTIPORT */
+#endif
+	unsigned int		 vp_iflow:1;		/* rx flow control */
+	uint16_t		 vp_rows;
+	uint16_t		 vp_cols;
+	u_char			*vp_rx_buf;
+	u_char			*vp_tx_buf;
+};
+
+struct viocon_softc {
+	struct device		 sc_dev;
+	struct virtio_softc	*sc_virtio;
+
+	struct virtqueue        *sc_c_vq_rx;
+	struct virtqueue        *sc_c_vq_tx;
+
+	unsigned int		 sc_max_ports;
+	struct viocon_port	**sc_ports;
+
+	bus_dmamap_t		 sc_dmamap;
+};
+
+int	viocon_match(struct device *, void *, void *);
+void	viocon_attach(struct device *, struct device *, void *);
+int	viocon_tx_intr(struct virtqueue *);
+int	viocon_tx_drain(struct viocon_port *, struct virtqueue *vq);
+int	viocon_rx_intr(struct virtqueue *);
+void	viocon_rx_soft(void *);
+void	viocon_rx_fill(struct viocon_port *);
+int	viocon_port_create(struct viocon_softc *, int);
+void	vioconstart(struct tty *);
+int	vioconhwiflow(struct tty *, int);
+int	vioconparam(struct tty *, struct termios *);
+int	vioconopen(dev_t, int, int, struct proc *);
+int	vioconclose(dev_t, int, int, struct proc *);
+int	vioconread(dev_t, struct uio *, int);
+int	vioconwrite(dev_t, struct uio *, int);
+int	vioconstop(struct tty *, int);
+int	vioconioctl(dev_t, u_long, caddr_t, int, struct proc *);
+struct tty	*viocontty(dev_t dev);
+
+struct cfattach viocon_ca = {
+	sizeof(struct viocon_softc),
+	viocon_match,
+	viocon_attach,
+	NULL
+};
+
+struct cfdriver viocon_cd = {
+	NULL, "viocon", DV_TTY
+};
+
+static inline struct viocon_softc *
+dev2sc(dev_t dev)
+{
+	return viocon_cd.cd_devs[VIOCONUNIT(dev)];
+}
+
+static inline struct viocon_port *
+dev2port(dev_t dev)
+{
+	return dev2sc(dev)->sc_ports[VIOCONPORT(dev)];
+}
+
+int viocon_match(struct device *parent, void *match, void *aux)
+{
+	struct virtio_softc *va = aux;
+	if (va->sc_childdevid == PCI_PRODUCT_VIRTIO_CONSOLE)
+		return 1;
+	return 0;
+}
+
+void
+viocon_attach(struct device *parent, struct device *self, void *aux)
+{
+	struct viocon_softc *sc = (struct viocon_softc *)self;
+	struct virtio_softc *vsc = (struct virtio_softc *)parent;
+	int maxports = 1;
+
+	if (vsc->sc_child)
+		panic("already attached to something else");
+	vsc->sc_child = self;
+	vsc->sc_ipl = IPL_TTY;
+	vsc->sc_intrhand = virtio_vq_intr;
+	vsc->sc_config_change = 0;
+	sc->sc_virtio = vsc;
+	sc->sc_max_ports = maxports;
+
+	vsc->sc_vqs = malloc(2 * (maxports + 1) * sizeof(struct virtqueue), M_DEVBUF,
+	    M_WAITOK|M_CANFAIL|M_ZERO);
+	sc->sc_ports = malloc(maxports * sizeof(sc->sc_ports[0]), M_DEVBUF,
+	    M_WAITOK|M_CANFAIL|M_ZERO);
+	if (vsc->sc_vqs == NULL || sc->sc_ports == NULL) {
+		printf("\n%s: Cannot allocate memory\n", __func__);
+		goto err;
+	}
+
+	virtio_negotiate_features(vsc, VIRTIO_CONSOLE_F_SIZE,
+	    viocon_feature_names);
+
+	printf("\n");
+	DBGPRINT("softc: %p\n", sc);
+	if (viocon_port_create(sc, 0) != 0) {
+		printf("\n%s: viocon_port_create failed\n", __func__);
+		goto err;
+	}
+	viocon_rx_fill(sc->sc_ports[0]);
+
+	return;
+err:
+	vsc->sc_child = VIRTIO_CHILD_ERROR;
+	free(vsc->sc_vqs, M_DEVBUF, 2 * (maxports + 1) * sizeof(struct virtqueue));
+	free(sc->sc_ports, M_DEVBUF, maxports * sizeof(sc->sc_ports[0]));
+}
+
+int
+viocon_port_create(struct viocon_softc *sc, int portidx)
+{
+	struct virtio_softc *vsc = sc->sc_virtio;
+	int rxidx, txidx, allocsize, nsegs;
+	char name[6];
+	struct viocon_port *vp;
+	caddr_t kva;
+	struct tty *tp;
+
+	vp = malloc(sizeof(*vp), M_DEVBUF, M_WAITOK|M_CANFAIL|M_ZERO);
+	if (vp == NULL)
+		return ENOMEM;
+	sc->sc_ports[portidx] = vp;
+	vp->vp_sc = sc;
+	DBGPRINT("vp: %p\n", vp);
+
+	if (portidx == 0)
+		rxidx = 0;
+	else
+		rxidx = 2 * (portidx + 1);
+	txidx = rxidx + 1;
+
+	snprintf(name, sizeof(name), "p%drx", portidx);
+	if (virtio_alloc_vq(vsc, &vsc->sc_vqs[rxidx], rxidx, BUFSIZE, 1,
+	    name) != 0) {
+		printf("\nCan't alloc %s virtqueue\n", name);
+		goto err;
+	}
+	vp->vp_rx = &vsc->sc_vqs[rxidx];
+	vp->vp_rx->vq_done = viocon_rx_intr;
+	vp->vp_si = softintr_establish(IPL_TTY, viocon_rx_soft, vp);
+	DBGPRINT("rx: %p\n", vp->vp_rx);
+
+	snprintf(name, sizeof(name), "p%dtx", portidx);
+	if (virtio_alloc_vq(vsc, &vsc->sc_vqs[txidx], txidx, BUFSIZE, 1,
+	    name) != 0) {
+		printf("\nCan't alloc %s virtqueue\n", name);
+		goto err;
+	}
+	vp->vp_tx = &vsc->sc_vqs[txidx];
+	vp->vp_tx->vq_done = viocon_tx_intr;
+	DBGPRINT("tx: %p\n", vp->vp_tx);
+
+	vsc->sc_nvqs += 2;
+
+	allocsize = (vp->vp_rx->vq_num + vp->vp_tx->vq_num) * BUFSIZE;
+
+	if (bus_dmamap_create(vsc->sc_dmat, allocsize, 1, allocsize, 0,
+	    BUS_DMA_NOWAIT | BUS_DMA_ALLOCNOW, &vp->vp_dmamap) != 0)
+		goto err;
+	if (bus_dmamem_alloc(vsc->sc_dmat, allocsize, 8, 0, &vp->vp_dmaseg,
+	    1, &nsegs, BUS_DMA_NOWAIT | BUS_DMA_ZERO) != 0)
+		goto err;
+	if (bus_dmamem_map(vsc->sc_dmat, &vp->vp_dmaseg, nsegs,
+	    allocsize, &kva, BUS_DMA_NOWAIT) != 0)
+		goto err;
+	if (bus_dmamap_load(vsc->sc_dmat, vp->vp_dmamap, kva,
+	    allocsize, NULL, BUS_DMA_NOWAIT) != 0)
+		goto err;
+	vp->vp_rx_buf = (unsigned char *)kva;
+	/*
+	 * XXX use only a small circular tx buffer instead of many BUFSIZE buffers?
+	 */
+	vp->vp_tx_buf = vp->vp_rx_buf + vp->vp_rx->vq_num * BUFSIZE;
+
+	if (vsc->sc_features & VIRTIO_CONSOLE_F_SIZE) {
+		vp->vp_cols = virtio_read_device_config_2(vsc,
+		    VIRTIO_CONSOLE_COLS);
+		vp->vp_rows = virtio_read_device_config_2(vsc,
+		    VIRTIO_CONSOLE_ROWS);
+	}
+
+	tp = ttymalloc(1000000);
+	tp->t_oproc = vioconstart;
+	tp->t_param = vioconparam;
+	tp->t_hwiflow = vioconhwiflow;
+	tp->t_dev = (sc->sc_dev.dv_unit << 4) | portidx;
+	vp->vp_tty = tp;
+	DBGPRINT("tty: %p\n", tp);
+
+	virtio_start_vq_intr(vsc, vp->vp_rx);
+	virtio_start_vq_intr(vsc, vp->vp_tx);
+
+	return 0;
+err:
+	panic("%s failed", __func__);
+	return -1;
+}
+
+int
+viocon_tx_drain(struct viocon_port *vp, struct virtqueue *vq)
+{
+	struct virtio_softc *vsc = vq->vq_owner;
+	int ndone = 0, len, slot;
+
+	splassert(IPL_TTY);
+	while (virtio_dequeue(vsc, vq, &slot, &len) == 0) {
+		bus_dmamap_sync(vsc->sc_dmat, vp->vp_dmamap,
+		    vp->vp_tx_buf - vp->vp_rx_buf + slot * BUFSIZE, BUFSIZE,
+		    BUS_DMASYNC_POSTREAD);
+		virtio_dequeue_commit(vq, slot);
+		ndone++;
+	}
+	return ndone;
+}
+
+int
+viocon_tx_intr(struct virtqueue *vq)
+{
+	struct virtio_softc *vsc = vq->vq_owner;
+	struct viocon_softc *sc = (struct viocon_softc *)vsc->sc_child;
+	int ndone = 0;
+	int portidx = (vq->vq_index - 1) / 2;
+	struct viocon_port *vp = sc->sc_ports[portidx];
+	struct tty *tp = vp->vp_tty;
+
+	splassert(IPL_TTY);
+	ndone = viocon_tx_drain(vp, vq);
+	if (ndone && ISSET(tp->t_state, TS_BUSY)) {
+		CLR(tp->t_state, TS_BUSY);
+		linesw[tp->t_line].l_start(tp);
+	}
+
+	return 1;
+}
+
+void
+viocon_rx_fill(struct viocon_port *vp)
+{
+	struct virtqueue *vq = vp->vp_rx;
+	struct virtio_softc *vsc = vp->vp_sc->sc_virtio;
+	int r, slot, ndone = 0;
+
+	while ((r = virtio_enqueue_prep(vq, &slot)) == 0) {
+		if (virtio_enqueue_reserve(vq, slot, 1) != 0)
+			break;
+		bus_dmamap_sync(vsc->sc_dmat, vp->vp_dmamap, slot * BUFSIZE,
+		    BUFSIZE, BUS_DMASYNC_PREREAD);
+		virtio_enqueue_p(vq, slot, vp->vp_dmamap, slot * BUFSIZE,
+		    BUFSIZE, 0);
+		virtio_enqueue_commit(vsc, vq, slot, 0);
+		ndone++;
+	}
+	KASSERT(r == 0 || r == EAGAIN);
+	if (ndone > 0)
+		virtio_notify(vsc, vq);
+}
+
+int
+viocon_rx_intr(struct virtqueue *vq)
+{
+	struct virtio_softc *vsc = vq->vq_owner;
+	struct viocon_softc *sc = (struct viocon_softc *)vsc->sc_child;
+	int portidx = (vq->vq_index - 1) / 2;
+	struct viocon_port *vp = sc->sc_ports[portidx];
+
+	softintr_schedule(vp->vp_si);
+	return 1;
+}
+
+void
+viocon_rx_soft(void *arg)
+{
+	struct viocon_port *vp = arg;
+	struct virtqueue *vq = vp->vp_rx;
+	struct virtio_softc *vsc = vq->vq_owner;
+	struct tty *tp = vp->vp_tty;
+	int slot, len, i;
+	u_char *p;
+
+	while (!vp->vp_iflow && virtio_dequeue(vsc, vq, &slot, &len) == 0) {
+		bus_dmamap_sync(vsc->sc_dmat, vp->vp_dmamap,
+		    slot * BUFSIZE, BUFSIZE, BUS_DMASYNC_POSTREAD);
+		p = vp->vp_rx_buf + slot * BUFSIZE;
+		for (i = 0; i < len; i++)
+			(*linesw[tp->t_line].l_rint)(*p++, tp);
+		virtio_dequeue_commit(vq, slot);
+	}
+
+	viocon_rx_fill(vp);
+
+	return;
+}
+
+void
+vioconstart(struct tty *tp)
+{
+	struct viocon_softc *sc = dev2sc(tp->t_dev);
+	struct virtio_softc *vsc;
+	struct viocon_port *vp = dev2port(tp->t_dev);
+	struct virtqueue *vq;
+	u_char *buf;
+	int s, cnt, slot, ret, ndone;
+
+	vsc = sc->sc_virtio;
+	vq = vp->vp_tx;
+
+	s = spltty();
+
+	ndone = viocon_tx_drain(vp, vq);
+	if (ISSET(tp->t_state, TS_BUSY)) {
+		if (ndone > 0)
+			CLR(tp->t_state, TS_BUSY);
+		else
+			goto out;
+	}
+	if (ISSET(tp->t_state, TS_TIMEOUT | TS_TTSTOP))
+		goto out;
+
+	if (tp->t_outq.c_cc == 0)
+		goto out;
+	ndone = 0;
+
+	while (tp->t_outq.c_cc > 0) {
+		ret = virtio_enqueue_prep(vq, &slot);
+		if (ret == EAGAIN)
+			break;
+		KASSERT(ret == 0);
+		ret = virtio_enqueue_reserve(vq, slot, 1);
+		KASSERT(ret == 0);
+		buf = vp->vp_tx_buf + slot * BUFSIZE;
+		cnt = q_to_b(&tp->t_outq, buf, BUFSIZE);
+		bus_dmamap_sync(vsc->sc_dmat, vp->vp_dmamap,
+		    vp->vp_tx_buf - vp->vp_rx_buf + slot * BUFSIZE, cnt,
+		    BUS_DMASYNC_PREWRITE);
+		virtio_enqueue_p(vq, slot, vp->vp_dmamap,
+		    vp->vp_tx_buf - vp->vp_rx_buf + slot * BUFSIZE, cnt, 1);
+		virtio_enqueue_commit(vsc, vq, slot, 0);
+		ndone++;
+	}
+	if (ret == EAGAIN)
+		SET(tp->t_state, TS_BUSY);
+	if (ndone > 0)
+		virtio_notify(vsc, vq);
+	ttwakeupwr(tp);
+out:
+	splx(s);
+}
+
+int
+vioconhwiflow(struct tty *tp, int stop)
+{
+	struct viocon_port *vp = dev2port(tp->t_dev);
+	int s;
+
+	s = spltty();
+	vp->vp_iflow = stop;
+	if (stop) {
+		virtio_stop_vq_intr(vp->vp_sc->sc_virtio, vp->vp_rx);
+	} else {
+		virtio_start_vq_intr(vp->vp_sc->sc_virtio, vp->vp_rx);
+		softintr_schedule(vp->vp_si);
+	}
+	splx(s);
+	return 1;
+}
+
+int
+vioconparam(struct tty *tp, struct termios *t)
+{
+	tp->t_ispeed = t->c_ispeed;
+	tp->t_ospeed = t->c_ospeed;
+	tp->t_cflag = t->c_cflag;
+
+	vioconstart(tp);
+	return 0;
+}
+
+int
+vioconopen(dev_t dev, int flag, int mode, struct proc *p)
+{
+	int unit = VIOCONUNIT(dev);
+	int port = VIOCONPORT(dev);
+	struct viocon_softc *sc;
+	struct viocon_port *vp;
+	struct tty *tp;
+	int s, error;
+
+	if (unit >= viocon_cd.cd_ndevs)
+		return (ENXIO);
+	sc = viocon_cd.cd_devs[unit];
+	if (sc == NULL)
+		return (ENXIO);
+	if (ISSET(sc->sc_dev.dv_flags, DVF_ACTIVE) == 0)
+		return (ENXIO);
+
+	s = spltty();
+	if (port >= sc->sc_max_ports) {
+		splx(s);
+		return (ENXIO);
+	}
+	vp = sc->sc_ports[port];
+	tp = vp->vp_tty;
+#ifdef NOTYET
+	vp->vp_guest_open = 1;
+#endif
+	splx(s);
+
+	if (!ISSET(tp->t_state, TS_ISOPEN)) {
+		SET(tp->t_state, TS_WOPEN);
+		ttychars(tp);
+		tp->t_ispeed = 1000000;
+		tp->t_ospeed = 1000000;
+		tp->t_cflag = TTYDEF_CFLAG|CLOCAL|CRTSCTS;
+		tp->t_iflag = TTYDEF_IFLAG;
+		tp->t_oflag = TTYDEF_OFLAG;
+		tp->t_lflag = TTYDEF_LFLAG;
+		if (vp->vp_cols != 0) {
+			tp->t_winsize.ws_col = vp->vp_cols;
+			tp->t_winsize.ws_row = vp->vp_rows;
+		}
+
+		s = spltty();
+		vioconparam(tp, &tp->t_termios);
+		ttsetwater(tp);
+		splx(s);
+	}
+	else if (ISSET(tp->t_state, TS_XCLUDE) && suser(p, 0) != 0) {
+		return (EBUSY);
+	}
+
+	error = linesw[tp->t_line].l_open(dev, tp, p);
+	return error;
+}
+
+int
+vioconclose(dev_t dev, int flag, int mode, struct proc *p)
+{
+	struct viocon_port *vp = dev2port(dev);
+	struct tty *tp = vp->vp_tty;
+	int s;
+
+	if (!ISSET(tp->t_state, TS_ISOPEN))
+		return 0;
+
+	linesw[tp->t_line].l_close(tp, flag, p);
+	s = spltty();
+#ifdef NOTYET
+	vp->vp_guest_open = 0;
+#endif
+	CLR(tp->t_state, TS_BUSY | TS_FLUSH);
+	ttyclose(tp);
+	splx(s);
+
+	return 0;
+}
+
+int
+vioconread(dev_t dev, struct uio *uio, int flag)
+{
+	struct viocon_port *vp = dev2port(dev);
+	struct tty *tp = vp->vp_tty;
+
+	return linesw[tp->t_line].l_read(tp, uio, flag);
+}
+
+int
+vioconwrite(dev_t dev, struct uio *uio, int flag)
+{
+	struct viocon_port *vp = dev2port(dev);
+	struct tty *tp = vp->vp_tty;
+
+	return linesw[tp->t_line].l_write(tp, uio, flag);
+}
+
+struct tty *
+viocontty(dev_t dev)
+{
+	struct viocon_port *vp = dev2port(dev);
+
+	return vp->vp_tty;
+}
+
+int
+vioconstop(struct tty *tp, int flag)
+{
+	int s;
+
+	s = spltty();
+	if (ISSET(tp->t_state, TS_BUSY))
+		if (!ISSET(tp->t_state, TS_TTSTOP))
+			SET(tp->t_state, TS_FLUSH);
+	splx(s);
+	return 0;
+}
+
+int
+vioconioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
+{
+	struct viocon_port *vp = dev2port(dev);
+	struct tty *tp;
+	int error1, error2;
+
+	tp = vp->vp_tty;
+
+	error1 = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
+	if (error1 >= 0)
+		return error1;
+	error2 = ttioctl(tp, cmd, data, flag, p);
+	if (error2 >= 0)
+		return error2;
+	return ENOTTY;
+}