Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 535 insertions, 0 deletions

diff --git a/drivers/input/mouse/vsxxxaa.c b/drivers/input/mouse/vsxxxaa.c
new file mode 100644
index 000000000..8af8e4a15
--- /dev/null
+++ b/drivers/input/mouse/vsxxxaa.c
@@ -0,0 +1,535 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for	DEC VSXXX-AA mouse (hockey-puck mouse, ball or two rollers)
+ *		DEC VSXXX-GA mouse (rectangular mouse, with ball)
+ *		DEC VSXXX-AB tablet (digitizer with hair cross or stylus)
+ *
+ * Copyright (C) 2003-2004 by Jan-Benedict Glaw <jbglaw@lug-owl.de>
+ *
+ * The packet format was initially taken from a patch to GPM which is (C) 2001
+ * by	Karsten Merker <merker@linuxtag.org>
+ * and	Maciej W. Rozycki <macro@ds2.pg.gda.pl>
+ * Later on, I had access to the device's documentation (referenced below).
+ */
+
+/*
+ * Building an adaptor to DE9 / DB25 RS232
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * DISCLAIMER: Use this description AT YOUR OWN RISK! I'll not pay for
+ * anything if you break your mouse, your computer or whatever!
+ *
+ * In theory, this mouse is a simple RS232 device. In practice, it has got
+ * a quite uncommon plug and the requirement to additionally get a power
+ * supply at +5V and -12V.
+ *
+ * If you look at the socket/jack (_not_ at the plug), we use this pin
+ * numbering:
+ *    _______
+ *   / 7 6 5 \
+ *  | 4 --- 3 |
+ *   \  2 1  /
+ *    -------
+ *
+ *	DEC socket	DE9	DB25	Note
+ *	1 (GND)		5	7	-
+ *	2 (RxD)		2	3	-
+ *	3 (TxD)		3	2	-
+ *	4 (-12V)	-	-	Somewhere from the PSU. At ATX, it's
+ *					the thin blue wire at pin 12 of the
+ *					ATX power connector. Only required for
+ *					VSXXX-AA/-GA mice.
+ *	5 (+5V)		-	-	PSU (red wires of ATX power connector
+ *					on pin 4, 6, 19 or 20) or HDD power
+ *					connector (also red wire).
+ *	6 (+12V)	-	-	HDD power connector, yellow wire. Only
+ *					required for VSXXX-AB digitizer.
+ *	7 (dev. avail.)	-	-	The mouse shorts this one to pin 1.
+ *					This way, the host computer can detect
+ *					the mouse. To use it with the adaptor,
+ *					simply don't connect this pin.
+ *
+ * So to get a working adaptor, you need to connect the mouse with three
+ * wires to a RS232 port and two or three additional wires for +5V, +12V and
+ * -12V to the PSU.
+ *
+ * Flow specification for the link is 4800, 8o1.
+ *
+ * The mice and tablet are described in "VCB02 Video Subsystem - Technical
+ * Manual", DEC EK-104AA-TM-001. You'll find it at MANX, a search engine
+ * specific for DEC documentation. Try
+ * http://www.vt100.net/manx/details?pn=EK-104AA-TM-001;id=21;cp=1
+ */
+
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/serio.h>
+
+#define DRIVER_DESC "Driver for DEC VSXXX-AA and -GA mice and VSXXX-AB tablet"
+
+MODULE_AUTHOR("Jan-Benedict Glaw <jbglaw@lug-owl.de>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+#undef VSXXXAA_DEBUG
+#ifdef VSXXXAA_DEBUG
+#define DBG(x...) printk(x)
+#else
+#define DBG(x...) do {} while (0)
+#endif
+
+#define VSXXXAA_INTRO_MASK	0x80
+#define VSXXXAA_INTRO_HEAD	0x80
+#define IS_HDR_BYTE(x)			\
+	(((x) & VSXXXAA_INTRO_MASK) == VSXXXAA_INTRO_HEAD)
+
+#define VSXXXAA_PACKET_MASK	0xe0
+#define VSXXXAA_PACKET_REL	0x80
+#define VSXXXAA_PACKET_ABS	0xc0
+#define VSXXXAA_PACKET_POR	0xa0
+#define MATCH_PACKET_TYPE(data, type)	\
+	(((data) & VSXXXAA_PACKET_MASK) == (type))
+
+
+
+struct vsxxxaa {
+	struct input_dev *dev;
+	struct serio *serio;
+#define BUFLEN 15 /* At least 5 is needed for a full tablet packet */
+	unsigned char buf[BUFLEN];
+	unsigned char count;
+	unsigned char version;
+	unsigned char country;
+	unsigned char type;
+	char name[64];
+	char phys[32];
+};
+
+static void vsxxxaa_drop_bytes(struct vsxxxaa *mouse, int num)
+{
+	if (num >= mouse->count) {
+		mouse->count = 0;
+	} else {
+		memmove(mouse->buf, mouse->buf + num, BUFLEN - num);
+		mouse->count -= num;
+	}
+}
+
+static void vsxxxaa_queue_byte(struct vsxxxaa *mouse, unsigned char byte)
+{
+	if (mouse->count == BUFLEN) {
+		printk(KERN_ERR "%s on %s: Dropping a byte of full buffer.\n",
+			mouse->name, mouse->phys);
+		vsxxxaa_drop_bytes(mouse, 1);
+	}
+
+	DBG(KERN_INFO "Queueing byte 0x%02x\n", byte);
+
+	mouse->buf[mouse->count++] = byte;
+}
+
+static void vsxxxaa_detection_done(struct vsxxxaa *mouse)
+{
+	switch (mouse->type) {
+	case 0x02:
+		strscpy(mouse->name, "DEC VSXXX-AA/-GA mouse",
+			sizeof(mouse->name));
+		break;
+
+	case 0x04:
+		strscpy(mouse->name, "DEC VSXXX-AB digitizer",
+			sizeof(mouse->name));
+		break;
+
+	default:
+		snprintf(mouse->name, sizeof(mouse->name),
+			 "unknown DEC pointer device (type = 0x%02x)",
+			 mouse->type);
+		break;
+	}
+
+	printk(KERN_INFO
+		"Found %s version 0x%02x from country 0x%02x on port %s\n",
+		mouse->name, mouse->version, mouse->country, mouse->phys);
+}
+
+/*
+ * Returns number of bytes to be dropped, 0 if packet is okay.
+ */
+static int vsxxxaa_check_packet(struct vsxxxaa *mouse, int packet_len)
+{
+	int i;
+
+	/* First byte must be a header byte */
+	if (!IS_HDR_BYTE(mouse->buf[0])) {
+		DBG("vsck: len=%d, 1st=0x%02x\n", packet_len, mouse->buf[0]);
+		return 1;
+	}
+
+	/* Check all following bytes */
+	for (i = 1; i < packet_len; i++) {
+		if (IS_HDR_BYTE(mouse->buf[i])) {
+			printk(KERN_ERR
+				"Need to drop %d bytes of a broken packet.\n",
+				i - 1);
+			DBG(KERN_INFO "check: len=%d, b[%d]=0x%02x\n",
+			    packet_len, i, mouse->buf[i]);
+			return i - 1;
+		}
+	}
+
+	return 0;
+}
+
+static inline int vsxxxaa_smells_like_packet(struct vsxxxaa *mouse,
+					     unsigned char type, size_t len)
+{
+	return mouse->count >= len && MATCH_PACKET_TYPE(mouse->buf[0], type);
+}
+
+static void vsxxxaa_handle_REL_packet(struct vsxxxaa *mouse)
+{
+	struct input_dev *dev = mouse->dev;
+	unsigned char *buf = mouse->buf;
+	int left, middle, right;
+	int dx, dy;
+
+	/*
+	 * Check for normal stream packets. This is three bytes,
+	 * with the first byte's 3 MSB set to 100.
+	 *
+	 * [0]:	1	0	0	SignX	SignY	Left	Middle	Right
+	 * [1]: 0	dx	dx	dx	dx	dx	dx	dx
+	 * [2]:	0	dy	dy	dy	dy	dy	dy	dy
+	 */
+
+	/*
+	 * Low 7 bit of byte 1 are abs(dx), bit 7 is
+	 * 0, bit 4 of byte 0 is direction.
+	 */
+	dx = buf[1] & 0x7f;
+	dx *= ((buf[0] >> 4) & 0x01) ? 1 : -1;
+
+	/*
+	 * Low 7 bit of byte 2 are abs(dy), bit 7 is
+	 * 0, bit 3 of byte 0 is direction.
+	 */
+	dy = buf[2] & 0x7f;
+	dy *= ((buf[0] >> 3) & 0x01) ? -1 : 1;
+
+	/*
+	 * Get button state. It's the low three bits
+	 * (for three buttons) of byte 0.
+	 */
+	left	= buf[0] & 0x04;
+	middle	= buf[0] & 0x02;
+	right	= buf[0] & 0x01;
+
+	vsxxxaa_drop_bytes(mouse, 3);
+
+	DBG(KERN_INFO "%s on %s: dx=%d, dy=%d, buttons=%s%s%s\n",
+	    mouse->name, mouse->phys, dx, dy,
+	    left ? "L" : "l", middle ? "M" : "m", right ? "R" : "r");
+
+	/*
+	 * Report what we've found so far...
+	 */
+	input_report_key(dev, BTN_LEFT, left);
+	input_report_key(dev, BTN_MIDDLE, middle);
+	input_report_key(dev, BTN_RIGHT, right);
+	input_report_key(dev, BTN_TOUCH, 0);
+	input_report_rel(dev, REL_X, dx);
+	input_report_rel(dev, REL_Y, dy);
+	input_sync(dev);
+}
+
+static void vsxxxaa_handle_ABS_packet(struct vsxxxaa *mouse)
+{
+	struct input_dev *dev = mouse->dev;
+	unsigned char *buf = mouse->buf;
+	int left, middle, right, touch;
+	int x, y;
+
+	/*
+	 * Tablet position / button packet
+	 *
+	 * [0]:	1	1	0	B4	B3	B2	B1	Pr
+	 * [1]:	0	0	X5	X4	X3	X2	X1	X0
+	 * [2]:	0	0	X11	X10	X9	X8	X7	X6
+	 * [3]:	0	0	Y5	Y4	Y3	Y2	Y1	Y0
+	 * [4]:	0	0	Y11	Y10	Y9	Y8	Y7	Y6
+	 */
+
+	/*
+	 * Get X/Y position. Y axis needs to be inverted since VSXXX-AB
+	 * counts down->top while monitor counts top->bottom.
+	 */
+	x = ((buf[2] & 0x3f) << 6) | (buf[1] & 0x3f);
+	y = ((buf[4] & 0x3f) << 6) | (buf[3] & 0x3f);
+	y = 1023 - y;
+
+	/*
+	 * Get button state. It's bits <4..1> of byte 0.
+	 */
+	left	= buf[0] & 0x02;
+	middle	= buf[0] & 0x04;
+	right	= buf[0] & 0x08;
+	touch	= buf[0] & 0x10;
+
+	vsxxxaa_drop_bytes(mouse, 5);
+
+	DBG(KERN_INFO "%s on %s: x=%d, y=%d, buttons=%s%s%s%s\n",
+	    mouse->name, mouse->phys, x, y,
+	    left ? "L" : "l", middle ? "M" : "m",
+	    right ? "R" : "r", touch ? "T" : "t");
+
+	/*
+	 * Report what we've found so far...
+	 */
+	input_report_key(dev, BTN_LEFT, left);
+	input_report_key(dev, BTN_MIDDLE, middle);
+	input_report_key(dev, BTN_RIGHT, right);
+	input_report_key(dev, BTN_TOUCH, touch);
+	input_report_abs(dev, ABS_X, x);
+	input_report_abs(dev, ABS_Y, y);
+	input_sync(dev);
+}
+
+static void vsxxxaa_handle_POR_packet(struct vsxxxaa *mouse)
+{
+	struct input_dev *dev = mouse->dev;
+	unsigned char *buf = mouse->buf;
+	int left, middle, right;
+	unsigned char error;
+
+	/*
+	 * Check for Power-On-Reset packets. These are sent out
+	 * after plugging the mouse in, or when explicitly
+	 * requested by sending 'T'.
+	 *
+	 * [0]:	1	0	1	0	R3	R2	R1	R0
+	 * [1]:	0	M2	M1	M0	D3	D2	D1	D0
+	 * [2]:	0	E6	E5	E4	E3	E2	E1	E0
+	 * [3]:	0	0	0	0	0	Left	Middle	Right
+	 *
+	 * M: manufacturer location code
+	 * R: revision code
+	 * E: Error code. If it's in the range of 0x00..0x1f, only some
+	 *    minor problem occurred. Errors >= 0x20 are considered bad
+	 *    and the device may not work properly...
+	 * D: <0010> == mouse, <0100> == tablet
+	 */
+
+	mouse->version = buf[0] & 0x0f;
+	mouse->country = (buf[1] >> 4) & 0x07;
+	mouse->type = buf[1] & 0x0f;
+	error = buf[2] & 0x7f;
+
+	/*
+	 * Get button state. It's the low three bits
+	 * (for three buttons) of byte 0. Maybe even the bit <3>
+	 * has some meaning if a tablet is attached.
+	 */
+	left	= buf[0] & 0x04;
+	middle	= buf[0] & 0x02;
+	right	= buf[0] & 0x01;
+
+	vsxxxaa_drop_bytes(mouse, 4);
+	vsxxxaa_detection_done(mouse);
+
+	if (error <= 0x1f) {
+		/* No (serious) error. Report buttons */
+		input_report_key(dev, BTN_LEFT, left);
+		input_report_key(dev, BTN_MIDDLE, middle);
+		input_report_key(dev, BTN_RIGHT, right);
+		input_report_key(dev, BTN_TOUCH, 0);
+		input_sync(dev);
+
+		if (error != 0)
+			printk(KERN_INFO "Your %s on %s reports error=0x%02x\n",
+				mouse->name, mouse->phys, error);
+
+	}
+
+	/*
+	 * If the mouse was hot-plugged, we need to force differential mode
+	 * now... However, give it a second to recover from it's reset.
+	 */
+	printk(KERN_NOTICE
+		"%s on %s: Forcing standard packet format, "
+		"incremental streaming mode and 72 samples/sec\n",
+		mouse->name, mouse->phys);
+	serio_write(mouse->serio, 'S');	/* Standard format */
+	mdelay(50);
+	serio_write(mouse->serio, 'R');	/* Incremental */
+	mdelay(50);
+	serio_write(mouse->serio, 'L');	/* 72 samples/sec */
+}
+
+static void vsxxxaa_parse_buffer(struct vsxxxaa *mouse)
+{
+	unsigned char *buf = mouse->buf;
+	int stray_bytes;
+
+	/*
+	 * Parse buffer to death...
+	 */
+	do {
+		/*
+		 * Out of sync? Throw away what we don't understand. Each
+		 * packet starts with a byte whose bit 7 is set. Unhandled
+		 * packets (ie. which we don't know about or simply b0rk3d
+		 * data...) will get shifted out of the buffer after some
+		 * activity on the mouse.
+		 */
+		while (mouse->count > 0 && !IS_HDR_BYTE(buf[0])) {
+			printk(KERN_ERR "%s on %s: Dropping a byte to regain "
+				"sync with mouse data stream...\n",
+				mouse->name, mouse->phys);
+			vsxxxaa_drop_bytes(mouse, 1);
+		}
+
+		/*
+		 * Check for packets we know about.
+		 */
+
+		if (vsxxxaa_smells_like_packet(mouse, VSXXXAA_PACKET_REL, 3)) {
+			/* Check for broken packet */
+			stray_bytes = vsxxxaa_check_packet(mouse, 3);
+			if (!stray_bytes)
+				vsxxxaa_handle_REL_packet(mouse);
+
+		} else if (vsxxxaa_smells_like_packet(mouse,
+						      VSXXXAA_PACKET_ABS, 5)) {
+			/* Check for broken packet */
+			stray_bytes = vsxxxaa_check_packet(mouse, 5);
+			if (!stray_bytes)
+				vsxxxaa_handle_ABS_packet(mouse);
+
+		} else if (vsxxxaa_smells_like_packet(mouse,
+						      VSXXXAA_PACKET_POR, 4)) {
+			/* Check for broken packet */
+			stray_bytes = vsxxxaa_check_packet(mouse, 4);
+			if (!stray_bytes)
+				vsxxxaa_handle_POR_packet(mouse);
+
+		} else {
+			break; /* No REL, ABS or POR packet found */
+		}
+
+		if (stray_bytes > 0) {
+			printk(KERN_ERR "Dropping %d bytes now...\n",
+				stray_bytes);
+			vsxxxaa_drop_bytes(mouse, stray_bytes);
+		}
+
+	} while (1);
+}
+
+static irqreturn_t vsxxxaa_interrupt(struct serio *serio,
+				     unsigned char data, unsigned int flags)
+{
+	struct vsxxxaa *mouse = serio_get_drvdata(serio);
+
+	vsxxxaa_queue_byte(mouse, data);
+	vsxxxaa_parse_buffer(mouse);
+
+	return IRQ_HANDLED;
+}
+
+static void vsxxxaa_disconnect(struct serio *serio)
+{
+	struct vsxxxaa *mouse = serio_get_drvdata(serio);
+
+	serio_close(serio);
+	serio_set_drvdata(serio, NULL);
+	input_unregister_device(mouse->dev);
+	kfree(mouse);
+}
+
+static int vsxxxaa_connect(struct serio *serio, struct serio_driver *drv)
+{
+	struct vsxxxaa *mouse;
+	struct input_dev *input_dev;
+	int err = -ENOMEM;
+
+	mouse = kzalloc(sizeof(struct vsxxxaa), GFP_KERNEL);
+	input_dev = input_allocate_device();
+	if (!mouse || !input_dev)
+		goto fail1;
+
+	mouse->dev = input_dev;
+	mouse->serio = serio;
+	strlcat(mouse->name, "DEC VSXXX-AA/-GA mouse or VSXXX-AB digitizer",
+		 sizeof(mouse->name));
+	snprintf(mouse->phys, sizeof(mouse->phys), "%s/input0", serio->phys);
+
+	input_dev->name = mouse->name;
+	input_dev->phys = mouse->phys;
+	input_dev->id.bustype = BUS_RS232;
+	input_dev->dev.parent = &serio->dev;
+
+	__set_bit(EV_KEY, input_dev->evbit);		/* We have buttons */
+	__set_bit(EV_REL, input_dev->evbit);
+	__set_bit(EV_ABS, input_dev->evbit);
+	__set_bit(BTN_LEFT, input_dev->keybit);		/* We have 3 buttons */
+	__set_bit(BTN_MIDDLE, input_dev->keybit);
+	__set_bit(BTN_RIGHT, input_dev->keybit);
+	__set_bit(BTN_TOUCH, input_dev->keybit);	/* ...and Tablet */
+	__set_bit(REL_X, input_dev->relbit);
+	__set_bit(REL_Y, input_dev->relbit);
+	input_set_abs_params(input_dev, ABS_X, 0, 1023, 0, 0);
+	input_set_abs_params(input_dev, ABS_Y, 0, 1023, 0, 0);
+
+	serio_set_drvdata(serio, mouse);
+
+	err = serio_open(serio, drv);
+	if (err)
+		goto fail2;
+
+	/*
+	 * Request selftest. Standard packet format and differential
+	 * mode will be requested after the device ID'ed successfully.
+	 */
+	serio_write(serio, 'T'); /* Test */
+
+	err = input_register_device(input_dev);
+	if (err)
+		goto fail3;
+
+	return 0;
+
+ fail3:	serio_close(serio);
+ fail2:	serio_set_drvdata(serio, NULL);
+ fail1:	input_free_device(input_dev);
+	kfree(mouse);
+	return err;
+}
+
+static struct serio_device_id vsxxaa_serio_ids[] = {
+	{
+		.type	= SERIO_RS232,
+		.proto	= SERIO_VSXXXAA,
+		.id	= SERIO_ANY,
+		.extra	= SERIO_ANY,
+	},
+	{ 0 }
+};
+
+MODULE_DEVICE_TABLE(serio, vsxxaa_serio_ids);
+
+static struct serio_driver vsxxxaa_drv = {
+	.driver		= {
+		.name	= "vsxxxaa",
+	},
+	.description	= DRIVER_DESC,
+	.id_table	= vsxxaa_serio_ids,
+	.connect	= vsxxxaa_connect,
+	.interrupt	= vsxxxaa_interrupt,
+	.disconnect	= vsxxxaa_disconnect,
+};
+
+module_serio_driver(vsxxxaa_drv);