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, 809 insertions, 0 deletions

diff --git a/drivers/input/joystick/sidewinder.c b/drivers/input/joystick/sidewinder.c
new file mode 100644
index 000000000..7282301c3
--- /dev/null
+++ b/drivers/input/joystick/sidewinder.c
@@ -0,0 +1,809 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  Copyright (c) 1998-2005 Vojtech Pavlik
+ */
+
+/*
+ * Microsoft SideWinder joystick family driver for Linux
+ */
+
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/gameport.h>
+#include <linux/jiffies.h>
+
+#define DRIVER_DESC	"Microsoft SideWinder joystick family driver"
+
+MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+/*
+ * These are really magic values. Changing them can make a problem go away,
+ * as well as break everything.
+ */
+
+#undef SW_DEBUG
+#undef SW_DEBUG_DATA
+
+#define SW_START	600	/* The time we wait for the first bit [600 us] */
+#define SW_STROBE	60	/* Max time per bit [60 us] */
+#define SW_TIMEOUT	6	/* Wait for everything to settle [6 ms] */
+#define SW_KICK		45	/* Wait after A0 fall till kick [45 us] */
+#define SW_END		8	/* Number of bits before end of packet to kick */
+#define SW_FAIL		16	/* Number of packet read errors to fail and reinitialize */
+#define SW_BAD		2	/* Number of packet read errors to switch off 3d Pro optimization */
+#define SW_OK		64	/* Number of packet read successes to switch optimization back on */
+#define SW_LENGTH	512	/* Max number of bits in a packet */
+
+#ifdef SW_DEBUG
+#define dbg(format, arg...) printk(KERN_DEBUG __FILE__ ": " format "\n" , ## arg)
+#else
+#define dbg(format, arg...) do {} while (0)
+#endif
+
+/*
+ * SideWinder joystick types ...
+ */
+
+#define SW_ID_3DP	0
+#define SW_ID_GP	1
+#define SW_ID_PP	2
+#define SW_ID_FFP	3
+#define SW_ID_FSP	4
+#define SW_ID_FFW	5
+
+/*
+ * Names, buttons, axes ...
+ */
+
+static char *sw_name[] = {	"3D Pro", "GamePad", "Precision Pro", "Force Feedback Pro", "FreeStyle Pro",
+				"Force Feedback Wheel" };
+
+static char sw_abs[][7] = {
+	{ ABS_X, ABS_Y, ABS_RZ, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
+	{ ABS_X, ABS_Y },
+	{ ABS_X, ABS_Y, ABS_RZ, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
+	{ ABS_X, ABS_Y, ABS_RZ, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
+	{ ABS_X, ABS_Y,         ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
+	{ ABS_RX, ABS_RUDDER,   ABS_THROTTLE }};
+
+static char sw_bit[][7] = {
+	{ 10, 10,  9, 10,  1,  1 },
+	{  1,  1                 },
+	{ 10, 10,  6,  7,  1,  1 },
+	{ 10, 10,  6,  7,  1,  1 },
+	{ 10, 10,  6,  1,  1     },
+	{ 10,  7,  7,  1,  1     }};
+
+static short sw_btn[][12] = {
+	{ BTN_TRIGGER, BTN_TOP, BTN_THUMB, BTN_THUMB2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_MODE },
+	{ BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_START, BTN_MODE },
+	{ BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_SELECT },
+	{ BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_SELECT },
+	{ BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_START, BTN_MODE, BTN_SELECT },
+	{ BTN_TRIGGER, BTN_TOP, BTN_THUMB, BTN_THUMB2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4 }};
+
+static struct {
+	int x;
+	int y;
+} sw_hat_to_axis[] = {{ 0, 0}, { 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};
+
+struct sw {
+	struct gameport *gameport;
+	struct input_dev *dev[4];
+	char name[64];
+	char phys[4][32];
+	int length;
+	int type;
+	int bits;
+	int number;
+	int fail;
+	int ok;
+	int reads;
+	int bads;
+};
+
+/*
+ * sw_read_packet() is a function which reads either a data packet, or an
+ * identification packet from a SideWinder joystick. The protocol is very,
+ * very, very braindamaged. Microsoft patented it in US patent #5628686.
+ */
+
+static int sw_read_packet(struct gameport *gameport, unsigned char *buf, int length, int id)
+{
+	unsigned long flags;
+	int timeout, bitout, sched, i, kick, start, strobe;
+	unsigned char pending, u, v;
+
+	i = -id;						/* Don't care about data, only want ID */
+	timeout = id ? gameport_time(gameport, SW_TIMEOUT * 1000) : 0; /* Set up global timeout for ID packet */
+	kick = id ? gameport_time(gameport, SW_KICK) : 0;	/* Set up kick timeout for ID packet */
+	start = gameport_time(gameport, SW_START);
+	strobe = gameport_time(gameport, SW_STROBE);
+	bitout = start;
+	pending = 0;
+	sched = 0;
+
+        local_irq_save(flags);					/* Quiet, please */
+
+	gameport_trigger(gameport);				/* Trigger */
+	v = gameport_read(gameport);
+
+	do {
+		bitout--;
+		u = v;
+		v = gameport_read(gameport);
+	} while (!(~v & u & 0x10) && (bitout > 0));		/* Wait for first falling edge on clock */
+
+	if (bitout > 0)
+		bitout = strobe;				/* Extend time if not timed out */
+
+	while ((timeout > 0 || bitout > 0) && (i < length)) {
+
+		timeout--;
+		bitout--;					/* Decrement timers */
+		sched--;
+
+		u = v;
+		v = gameport_read(gameport);
+
+		if ((~u & v & 0x10) && (bitout > 0)) {		/* Rising edge on clock - data bit */
+			if (i >= 0)				/* Want this data */
+				buf[i] = v >> 5;		/* Store it */
+			i++;					/* Advance index */
+			bitout = strobe;			/* Extend timeout for next bit */
+		}
+
+		if (kick && (~v & u & 0x01)) {			/* Falling edge on axis 0 */
+			sched = kick;				/* Schedule second trigger */
+			kick = 0;				/* Don't schedule next time on falling edge */
+			pending = 1;				/* Mark schedule */
+		}
+
+		if (pending && sched < 0 && (i > -SW_END)) {	/* Second trigger time */
+			gameport_trigger(gameport);		/* Trigger */
+			bitout = start;				/* Long bit timeout */
+			pending = 0;				/* Unmark schedule */
+			timeout = 0;				/* Switch from global to bit timeouts */
+		}
+	}
+
+	local_irq_restore(flags);					/* Done - relax */
+
+#ifdef SW_DEBUG_DATA
+	{
+		int j;
+		printk(KERN_DEBUG "sidewinder.c: Read %d triplets. [", i);
+		for (j = 0; j < i; j++) printk("%d", buf[j]);
+		printk("]\n");
+	}
+#endif
+
+	return i;
+}
+
+/*
+ * sw_get_bits() and GB() compose bits from the triplet buffer into a __u64.
+ * Parameter 'pos' is bit number inside packet where to start at, 'num' is number
+ * of bits to be read, 'shift' is offset in the resulting __u64 to start at, bits
+ * is number of bits per triplet.
+ */
+
+#define GB(pos,num) sw_get_bits(buf, pos, num, sw->bits)
+
+static __u64 sw_get_bits(unsigned char *buf, int pos, int num, char bits)
+{
+	__u64 data = 0;
+	int tri = pos % bits;						/* Start position */
+	int i   = pos / bits;
+	int bit = 0;
+
+	while (num--) {
+		data |= (__u64)((buf[i] >> tri++) & 1) << bit++;	/* Transfer bit */
+		if (tri == bits) {
+			i++;						/* Next triplet */
+			tri = 0;
+		}
+	}
+
+	return data;
+}
+
+/*
+ * sw_init_digital() initializes a SideWinder 3D Pro joystick
+ * into digital mode.
+ */
+
+static void sw_init_digital(struct gameport *gameport)
+{
+	static const int seq[] = { 140, 140+725, 140+300, 0 };
+	unsigned long flags;
+	int i, t;
+
+        local_irq_save(flags);
+
+	i = 0;
+        do {
+                gameport_trigger(gameport);			/* Trigger */
+		t = gameport_time(gameport, SW_TIMEOUT * 1000);
+		while ((gameport_read(gameport) & 1) && t) t--;	/* Wait for axis to fall back to 0 */
+                udelay(seq[i]);					/* Delay magic time */
+        } while (seq[++i]);
+
+	gameport_trigger(gameport);				/* Last trigger */
+
+	local_irq_restore(flags);
+}
+
+/*
+ * sw_parity() computes parity of __u64
+ */
+
+static int sw_parity(__u64 t)
+{
+	int x = t ^ (t >> 32);
+
+	x ^= x >> 16;
+	x ^= x >> 8;
+	x ^= x >> 4;
+	x ^= x >> 2;
+	x ^= x >> 1;
+	return x & 1;
+}
+
+/*
+ * sw_ccheck() checks synchronization bits and computes checksum of nibbles.
+ */
+
+static int sw_check(__u64 t)
+{
+	unsigned char sum = 0;
+
+	if ((t & 0x8080808080808080ULL) ^ 0x80)			/* Sync */
+		return -1;
+
+	while (t) {						/* Sum */
+		sum += t & 0xf;
+		t >>= 4;
+	}
+
+	return sum & 0xf;
+}
+
+/*
+ * sw_parse() analyzes SideWinder joystick data, and writes the results into
+ * the axes and buttons arrays.
+ */
+
+static int sw_parse(unsigned char *buf, struct sw *sw)
+{
+	int hat, i, j;
+	struct input_dev *dev;
+
+	switch (sw->type) {
+
+		case SW_ID_3DP:
+
+			if (sw_check(GB(0,64)) || (hat = (GB(6,1) << 3) | GB(60,3)) > 8)
+				return -1;
+
+			dev = sw->dev[0];
+
+			input_report_abs(dev, ABS_X,        (GB( 3,3) << 7) | GB(16,7));
+			input_report_abs(dev, ABS_Y,        (GB( 0,3) << 7) | GB(24,7));
+			input_report_abs(dev, ABS_RZ,       (GB(35,2) << 7) | GB(40,7));
+			input_report_abs(dev, ABS_THROTTLE, (GB(32,3) << 7) | GB(48,7));
+
+			input_report_abs(dev, ABS_HAT0X, sw_hat_to_axis[hat].x);
+			input_report_abs(dev, ABS_HAT0Y, sw_hat_to_axis[hat].y);
+
+			for (j = 0; j < 7; j++)
+				input_report_key(dev, sw_btn[SW_ID_3DP][j], !GB(j+8,1));
+
+			input_report_key(dev, BTN_BASE4, !GB(38,1));
+			input_report_key(dev, BTN_BASE5, !GB(37,1));
+
+			input_sync(dev);
+
+			return 0;
+
+		case SW_ID_GP:
+
+			for (i = 0; i < sw->number; i ++) {
+
+				if (sw_parity(GB(i*15,15)))
+					return -1;
+
+				input_report_abs(sw->dev[i], ABS_X, GB(i*15+3,1) - GB(i*15+2,1));
+				input_report_abs(sw->dev[i], ABS_Y, GB(i*15+0,1) - GB(i*15+1,1));
+
+				for (j = 0; j < 10; j++)
+					input_report_key(sw->dev[i], sw_btn[SW_ID_GP][j], !GB(i*15+j+4,1));
+
+				input_sync(sw->dev[i]);
+			}
+
+			return 0;
+
+		case SW_ID_PP:
+		case SW_ID_FFP:
+
+			if (!sw_parity(GB(0,48)) || (hat = GB(42,4)) > 8)
+				return -1;
+
+			dev = sw->dev[0];
+			input_report_abs(dev, ABS_X,        GB( 9,10));
+			input_report_abs(dev, ABS_Y,        GB(19,10));
+			input_report_abs(dev, ABS_RZ,       GB(36, 6));
+			input_report_abs(dev, ABS_THROTTLE, GB(29, 7));
+
+			input_report_abs(dev, ABS_HAT0X, sw_hat_to_axis[hat].x);
+			input_report_abs(dev, ABS_HAT0Y, sw_hat_to_axis[hat].y);
+
+			for (j = 0; j < 9; j++)
+				input_report_key(dev, sw_btn[SW_ID_PP][j], !GB(j,1));
+
+			input_sync(dev);
+
+			return 0;
+
+		case SW_ID_FSP:
+
+			if (!sw_parity(GB(0,43)) || (hat = GB(28,4)) > 8)
+				return -1;
+
+			dev = sw->dev[0];
+			input_report_abs(dev, ABS_X,        GB( 0,10));
+			input_report_abs(dev, ABS_Y,        GB(16,10));
+			input_report_abs(dev, ABS_THROTTLE, GB(32, 6));
+
+			input_report_abs(dev, ABS_HAT0X, sw_hat_to_axis[hat].x);
+			input_report_abs(dev, ABS_HAT0Y, sw_hat_to_axis[hat].y);
+
+			for (j = 0; j < 6; j++)
+				input_report_key(dev, sw_btn[SW_ID_FSP][j], !GB(j+10,1));
+
+			input_report_key(dev, BTN_TR,     !GB(26,1));
+			input_report_key(dev, BTN_START,  !GB(27,1));
+			input_report_key(dev, BTN_MODE,   !GB(38,1));
+			input_report_key(dev, BTN_SELECT, !GB(39,1));
+
+			input_sync(dev);
+
+			return 0;
+
+		case SW_ID_FFW:
+
+			if (!sw_parity(GB(0,33)))
+				return -1;
+
+			dev = sw->dev[0];
+			input_report_abs(dev, ABS_RX,       GB( 0,10));
+			input_report_abs(dev, ABS_RUDDER,   GB(10, 6));
+			input_report_abs(dev, ABS_THROTTLE, GB(16, 6));
+
+			for (j = 0; j < 8; j++)
+				input_report_key(dev, sw_btn[SW_ID_FFW][j], !GB(j+22,1));
+
+			input_sync(dev);
+
+			return 0;
+	}
+
+	return -1;
+}
+
+/*
+ * sw_read() reads SideWinder joystick data, and reinitializes
+ * the joystick in case of persistent problems. This is the function that is
+ * called from the generic code to poll the joystick.
+ */
+
+static int sw_read(struct sw *sw)
+{
+	unsigned char buf[SW_LENGTH];
+	int i;
+
+	i = sw_read_packet(sw->gameport, buf, sw->length, 0);
+
+	if (sw->type == SW_ID_3DP && sw->length == 66 && i != 66) {		/* Broken packet, try to fix */
+
+		if (i == 64 && !sw_check(sw_get_bits(buf,0,64,1))) {		/* Last init failed, 1 bit mode */
+			printk(KERN_WARNING "sidewinder.c: Joystick in wrong mode on %s"
+				" - going to reinitialize.\n", sw->gameport->phys);
+			sw->fail = SW_FAIL;					/* Reinitialize */
+			i = 128;						/* Bogus value */
+		}
+
+		if (i < 66 && GB(0,64) == GB(i*3-66,64))			/* 1 == 3 */
+			i = 66;							/* Everything is fine */
+
+		if (i < 66 && GB(0,64) == GB(66,64))				/* 1 == 2 */
+			i = 66;							/* Everything is fine */
+
+		if (i < 66 && GB(i*3-132,64) == GB(i*3-66,64)) {		/* 2 == 3 */
+			memmove(buf, buf + i - 22, 22);				/* Move data */
+			i = 66;							/* Carry on */
+		}
+	}
+
+	if (i == sw->length && !sw_parse(buf, sw)) {				/* Parse data */
+
+		sw->fail = 0;
+		sw->ok++;
+
+		if (sw->type == SW_ID_3DP && sw->length == 66			/* Many packets OK */
+			&& sw->ok > SW_OK) {
+
+			printk(KERN_INFO "sidewinder.c: No more trouble on %s"
+				" - enabling optimization again.\n", sw->gameport->phys);
+			sw->length = 22;
+		}
+
+		return 0;
+	}
+
+	sw->ok = 0;
+	sw->fail++;
+
+	if (sw->type == SW_ID_3DP && sw->length == 22 && sw->fail > SW_BAD) {	/* Consecutive bad packets */
+
+		printk(KERN_INFO "sidewinder.c: Many bit errors on %s"
+			" - disabling optimization.\n", sw->gameport->phys);
+		sw->length = 66;
+	}
+
+	if (sw->fail < SW_FAIL)
+		return -1;							/* Not enough, don't reinitialize yet */
+
+	printk(KERN_WARNING "sidewinder.c: Too many bit errors on %s"
+		" - reinitializing joystick.\n", sw->gameport->phys);
+
+	if (!i && sw->type == SW_ID_3DP) {					/* 3D Pro can be in analog mode */
+		mdelay(3 * SW_TIMEOUT);
+		sw_init_digital(sw->gameport);
+	}
+
+	mdelay(SW_TIMEOUT);
+	i = sw_read_packet(sw->gameport, buf, SW_LENGTH, 0);			/* Read normal data packet */
+	mdelay(SW_TIMEOUT);
+	sw_read_packet(sw->gameport, buf, SW_LENGTH, i);			/* Read ID packet, this initializes the stick */
+
+	sw->fail = SW_FAIL;
+
+	return -1;
+}
+
+static void sw_poll(struct gameport *gameport)
+{
+	struct sw *sw = gameport_get_drvdata(gameport);
+
+	sw->reads++;
+	if (sw_read(sw))
+		sw->bads++;
+}
+
+static int sw_open(struct input_dev *dev)
+{
+	struct sw *sw = input_get_drvdata(dev);
+
+	gameport_start_polling(sw->gameport);
+	return 0;
+}
+
+static void sw_close(struct input_dev *dev)
+{
+	struct sw *sw = input_get_drvdata(dev);
+
+	gameport_stop_polling(sw->gameport);
+}
+
+/*
+ * sw_print_packet() prints the contents of a SideWinder packet.
+ */
+
+static void sw_print_packet(char *name, int length, unsigned char *buf, char bits)
+{
+	int i;
+
+	printk(KERN_INFO "sidewinder.c: %s packet, %d bits. [", name, length);
+	for (i = (((length + 3) >> 2) - 1); i >= 0; i--)
+		printk("%x", (int)sw_get_bits(buf, i << 2, 4, bits));
+	printk("]\n");
+}
+
+/*
+ * sw_3dp_id() translates the 3DP id into a human legible string.
+ * Unfortunately I don't know how to do this for the other SW types.
+ */
+
+static void sw_3dp_id(unsigned char *buf, char *comment, size_t size)
+{
+	int i;
+	char pnp[8], rev[9];
+
+	for (i = 0; i < 7; i++)						/* ASCII PnP ID */
+		pnp[i] = sw_get_bits(buf, 24+8*i, 8, 1);
+
+	for (i = 0; i < 8; i++)						/* ASCII firmware revision */
+		rev[i] = sw_get_bits(buf, 88+8*i, 8, 1);
+
+	pnp[7] = rev[8] = 0;
+
+	snprintf(comment, size, " [PnP %d.%02d id %s rev %s]",
+		(int) ((sw_get_bits(buf, 8, 6, 1) << 6) |		/* Two 6-bit values */
+			sw_get_bits(buf, 16, 6, 1)) / 100,
+		(int) ((sw_get_bits(buf, 8, 6, 1) << 6) |
+			sw_get_bits(buf, 16, 6, 1)) % 100,
+		 pnp, rev);
+}
+
+/*
+ * sw_guess_mode() checks the upper two button bits for toggling -
+ * indication of that the joystick is in 3-bit mode. This is documented
+ * behavior for 3DP ID packet, and for example the FSP does this in
+ * normal packets instead. Fun ...
+ */
+
+static int sw_guess_mode(unsigned char *buf, int len)
+{
+	int i;
+	unsigned char xor = 0;
+
+	for (i = 1; i < len; i++)
+		xor |= (buf[i - 1] ^ buf[i]) & 6;
+
+	return !!xor * 2 + 1;
+}
+
+/*
+ * sw_connect() probes for SideWinder type joysticks.
+ */
+
+static int sw_connect(struct gameport *gameport, struct gameport_driver *drv)
+{
+	struct sw *sw;
+	struct input_dev *input_dev;
+	int i, j, k, l;
+	int err = 0;
+	unsigned char *buf = NULL;	/* [SW_LENGTH] */
+	unsigned char *idbuf = NULL;	/* [SW_LENGTH] */
+	unsigned char m = 1;
+	char comment[40];
+
+	comment[0] = 0;
+
+	sw = kzalloc(sizeof(struct sw), GFP_KERNEL);
+	buf = kmalloc(SW_LENGTH, GFP_KERNEL);
+	idbuf = kmalloc(SW_LENGTH, GFP_KERNEL);
+	if (!sw || !buf || !idbuf) {
+		err = -ENOMEM;
+		goto fail1;
+	}
+
+	sw->gameport = gameport;
+
+	gameport_set_drvdata(gameport, sw);
+
+	err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
+	if (err)
+		goto fail1;
+
+	dbg("Init 0: Opened %s, io %#x, speed %d",
+		gameport->phys, gameport->io, gameport->speed);
+
+	i = sw_read_packet(gameport, buf, SW_LENGTH, 0);		/* Read normal packet */
+	msleep(SW_TIMEOUT);
+	dbg("Init 1: Mode %d. Length %d.", m , i);
+
+	if (!i) {							/* No data. 3d Pro analog mode? */
+		sw_init_digital(gameport);				/* Switch to digital */
+		msleep(SW_TIMEOUT);
+		i = sw_read_packet(gameport, buf, SW_LENGTH, 0);	/* Retry reading packet */
+		msleep(SW_TIMEOUT);
+		dbg("Init 1b: Length %d.", i);
+		if (!i) {						/* No data -> FAIL */
+			err = -ENODEV;
+			goto fail2;
+		}
+	}
+
+	j = sw_read_packet(gameport, idbuf, SW_LENGTH, i);		/* Read ID. This initializes the stick */
+	m |= sw_guess_mode(idbuf, j);					/* ID packet should carry mode info [3DP] */
+	dbg("Init 2: Mode %d. ID Length %d.", m, j);
+
+	if (j <= 0) {							/* Read ID failed. Happens in 1-bit mode on PP */
+		msleep(SW_TIMEOUT);
+		i = sw_read_packet(gameport, buf, SW_LENGTH, 0);	/* Retry reading packet */
+		m |= sw_guess_mode(buf, i);
+		dbg("Init 2b: Mode %d. Length %d.", m, i);
+		if (!i) {
+			err = -ENODEV;
+			goto fail2;
+		}
+		msleep(SW_TIMEOUT);
+		j = sw_read_packet(gameport, idbuf, SW_LENGTH, i);	/* Retry reading ID */
+		dbg("Init 2c: ID Length %d.", j);
+	}
+
+	sw->type = -1;
+	k = SW_FAIL;							/* Try SW_FAIL times */
+	l = 0;
+
+	do {
+		k--;
+		msleep(SW_TIMEOUT);
+		i = sw_read_packet(gameport, buf, SW_LENGTH, 0);	/* Read data packet */
+		dbg("Init 3: Mode %d. Length %d. Last %d. Tries %d.", m, i, l, k);
+
+		if (i > l) {						/* Longer? As we can only lose bits, it makes */
+									/* no sense to try detection for a packet shorter */
+			l = i;						/* than the previous one */
+
+			sw->number = 1;
+			sw->gameport = gameport;
+			sw->length = i;
+			sw->bits = m;
+
+			dbg("Init 3a: Case %d.\n", i * m);
+
+			switch (i * m) {
+				case 60:
+					sw->number++;
+					fallthrough;
+				case 45:				/* Ambiguous packet length */
+					if (j <= 40) {			/* ID length less or eq 40 -> FSP */
+					fallthrough;
+				case 43:
+						sw->type = SW_ID_FSP;
+						break;
+					}
+					sw->number++;
+					fallthrough;
+				case 30:
+					sw->number++;
+					fallthrough;
+				case 15:
+					sw->type = SW_ID_GP;
+					break;
+				case 33:
+				case 31:
+					sw->type = SW_ID_FFW;
+					break;
+				case 48:				/* Ambiguous */
+					if (j == 14) {			/* ID length 14*3 -> FFP */
+						sw->type = SW_ID_FFP;
+						sprintf(comment, " [AC %s]", sw_get_bits(idbuf,38,1,3) ? "off" : "on");
+					} else
+						sw->type = SW_ID_PP;
+					break;
+				case 66:
+					sw->bits = 3;
+					fallthrough;
+				case 198:
+					sw->length = 22;
+					fallthrough;
+				case 64:
+					sw->type = SW_ID_3DP;
+					if (j == 160)
+						sw_3dp_id(idbuf, comment, sizeof(comment));
+					break;
+			}
+		}
+
+	} while (k && sw->type == -1);
+
+	if (sw->type == -1) {
+		printk(KERN_WARNING "sidewinder.c: unknown joystick device detected "
+			"on %s, contact <vojtech@ucw.cz>\n", gameport->phys);
+		sw_print_packet("ID", j * 3, idbuf, 3);
+		sw_print_packet("Data", i * m, buf, m);
+		err = -ENODEV;
+		goto fail2;
+	}
+
+#ifdef SW_DEBUG
+	sw_print_packet("ID", j * 3, idbuf, 3);
+	sw_print_packet("Data", i * m, buf, m);
+#endif
+
+	gameport_set_poll_handler(gameport, sw_poll);
+	gameport_set_poll_interval(gameport, 20);
+
+	k = i;
+	l = j;
+
+	for (i = 0; i < sw->number; i++) {
+		int bits, code;
+
+		snprintf(sw->name, sizeof(sw->name),
+			 "Microsoft SideWinder %s", sw_name[sw->type]);
+		snprintf(sw->phys[i], sizeof(sw->phys[i]),
+			 "%s/input%d", gameport->phys, i);
+
+		sw->dev[i] = input_dev = input_allocate_device();
+		if (!input_dev) {
+			err = -ENOMEM;
+			goto fail3;
+		}
+
+		input_dev->name = sw->name;
+		input_dev->phys = sw->phys[i];
+		input_dev->id.bustype = BUS_GAMEPORT;
+		input_dev->id.vendor = GAMEPORT_ID_VENDOR_MICROSOFT;
+		input_dev->id.product = sw->type;
+		input_dev->id.version = 0x0100;
+		input_dev->dev.parent = &gameport->dev;
+
+		input_set_drvdata(input_dev, sw);
+
+		input_dev->open = sw_open;
+		input_dev->close = sw_close;
+
+		input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+
+		for (j = 0; (bits = sw_bit[sw->type][j]); j++) {
+			int min, max, fuzz, flat;
+
+			code = sw_abs[sw->type][j];
+			min = bits == 1 ? -1 : 0;
+			max = (1 << bits) - 1;
+			fuzz = (bits >> 1) >= 2 ? 1 << ((bits >> 1) - 2) : 0;
+			flat = code == ABS_THROTTLE || bits < 5 ?
+				0 : 1 << (bits - 5);
+
+			input_set_abs_params(input_dev, code,
+					     min, max, fuzz, flat);
+		}
+
+		for (j = 0; (code = sw_btn[sw->type][j]); j++)
+			__set_bit(code, input_dev->keybit);
+
+		dbg("%s%s [%d-bit id %d data %d]\n", sw->name, comment, m, l, k);
+
+		err = input_register_device(sw->dev[i]);
+		if (err)
+			goto fail4;
+	}
+
+ out:	kfree(buf);
+	kfree(idbuf);
+
+	return err;
+
+ fail4:	input_free_device(sw->dev[i]);
+ fail3:	while (--i >= 0)
+		input_unregister_device(sw->dev[i]);
+ fail2:	gameport_close(gameport);
+ fail1:	gameport_set_drvdata(gameport, NULL);
+	kfree(sw);
+	goto out;
+}
+
+static void sw_disconnect(struct gameport *gameport)
+{
+	struct sw *sw = gameport_get_drvdata(gameport);
+	int i;
+
+	for (i = 0; i < sw->number; i++)
+		input_unregister_device(sw->dev[i]);
+	gameport_close(gameport);
+	gameport_set_drvdata(gameport, NULL);
+	kfree(sw);
+}
+
+static struct gameport_driver sw_drv = {
+	.driver		= {
+		.name	= "sidewinder",
+		.owner	= THIS_MODULE,
+	},
+	.description	= DRIVER_DESC,
+	.connect	= sw_connect,
+	.disconnect	= sw_disconnect,
+};
+
+module_gameport_driver(sw_drv);