From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 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(). ... --- Documentation/input/devices/iforce-protocol.rst | 381 ++++++++++++++++++++++++ 1 file changed, 381 insertions(+) create mode 100644 Documentation/input/devices/iforce-protocol.rst (limited to 'Documentation/input/devices/iforce-protocol.rst') diff --git a/Documentation/input/devices/iforce-protocol.rst b/Documentation/input/devices/iforce-protocol.rst new file mode 100644 index 000000000..8634beac3 --- /dev/null +++ b/Documentation/input/devices/iforce-protocol.rst @@ -0,0 +1,381 @@ +=============== +Iforce Protocol +=============== + +:Author: Johann Deneux + +Home page at ``_ + +:Additions: by Vojtech Pavlik. + + +Introduction +============ + +This document describes what I managed to discover about the protocol used to +specify force effects to I-Force 2.0 devices. None of this information comes +from Immerse. That's why you should not trust what is written in this +document. This document is intended to help understanding the protocol. +This is not a reference. Comments and corrections are welcome. To contact me, +send an email to: johann.deneux@gmail.com + +.. warning:: + + I shall not be held responsible for any damage or harm caused if you try to + send data to your I-Force device based on what you read in this document. + +Preliminary Notes +================= + +All values are hexadecimal with big-endian encoding (msb on the left). Beware, +values inside packets are encoded using little-endian. Bytes whose roles are +unknown are marked ??? Information that needs deeper inspection is marked (?) + +General form of a packet +------------------------ + +This is how packets look when the device uses the rs232 to communicate. + +== == === ==== == +2B OP LEN DATA CS +== == === ==== == + +CS is the checksum. It is equal to the exclusive or of all bytes. + +When using USB: + +== ==== +OP DATA +== ==== + +The 2B, LEN and CS fields have disappeared, probably because USB handles +frames and data corruption is handled or unsignificant. + +First, I describe effects that are sent by the device to the computer + +Device input state +================== + +This packet is used to indicate the state of each button and the value of each +axis:: + + OP= 01 for a joystick, 03 for a wheel + LEN= Varies from device to device + 00 X-Axis lsb + 01 X-Axis msb + 02 Y-Axis lsb, or gas pedal for a wheel + 03 Y-Axis msb, or brake pedal for a wheel + 04 Throttle + 05 Buttons + 06 Lower 4 bits: Buttons + Upper 4 bits: Hat + 07 Rudder + +Device effects states +===================== + +:: + + OP= 02 + LEN= Varies + 00 ? Bit 1 (Value 2) is the value of the deadman switch + 01 Bit 8 is set if the effect is playing. Bits 0 to 7 are the effect id. + 02 ?? + 03 Address of parameter block changed (lsb) + 04 Address of parameter block changed (msb) + 05 Address of second parameter block changed (lsb) + ... depending on the number of parameter blocks updated + +Force effect +------------ + +:: + + OP= 01 + LEN= 0e + 00 Channel (when playing several effects at the same time, each must + be assigned a channel) + 01 Wave form + Val 00 Constant + Val 20 Square + Val 21 Triangle + Val 22 Sine + Val 23 Sawtooth up + Val 24 Sawtooth down + Val 40 Spring (Force = f(pos)) + Val 41 Friction (Force = f(velocity)) and Inertia + (Force = f(acceleration)) + + + 02 Axes affected and trigger + Bits 4-7: Val 2 = effect along one axis. Byte 05 indicates direction + Val 4 = X axis only. Byte 05 must contain 5a + Val 8 = Y axis only. Byte 05 must contain b4 + Val c = X and Y axes. Bytes 05 must contain 60 + Bits 0-3: Val 0 = No trigger + Val x+1 = Button x triggers the effect + When the whole byte is 0, cancel the previously set trigger + + 03-04 Duration of effect (little endian encoding, in ms) + + 05 Direction of effect, if applicable. Else, see 02 for value to assign. + + 06-07 Minimum time between triggering. + + 08-09 Address of periodicity or magnitude parameters + 0a-0b Address of attack and fade parameters, or ffff if none. + *or* + 08-09 Address of interactive parameters for X-axis, + or ffff if not applicable + 0a-0b Address of interactive parameters for Y-axis, + or ffff if not applicable + + 0c-0d Delay before execution of effect (little endian encoding, in ms) + + +Time based parameters +--------------------- + +Attack and fade +^^^^^^^^^^^^^^^ + +:: + + OP= 02 + LEN= 08 + 00-01 Address where to store the parameters + 02-03 Duration of attack (little endian encoding, in ms) + 04 Level at end of attack. Signed byte. + 05-06 Duration of fade. + 07 Level at end of fade. + +Magnitude +^^^^^^^^^ + +:: + + OP= 03 + LEN= 03 + 00-01 Address + 02 Level. Signed byte. + +Periodicity +^^^^^^^^^^^ + +:: + + OP= 04 + LEN= 07 + 00-01 Address + 02 Magnitude. Signed byte. + 03 Offset. Signed byte. + 04 Phase. Val 00 = 0 deg, Val 40 = 90 degs. + 05-06 Period (little endian encoding, in ms) + +Interactive parameters +---------------------- + +:: + + OP= 05 + LEN= 0a + 00-01 Address + 02 Positive Coeff + 03 Negative Coeff + 04+05 Offset (center) + 06+07 Dead band (Val 01F4 = 5000 (decimal)) + 08 Positive saturation (Val 0a = 1000 (decimal) Val 64 = 10000 (decimal)) + 09 Negative saturation + +The encoding is a bit funny here: For coeffs, these are signed values. The +maximum value is 64 (100 decimal), the min is 9c. +For the offset, the minimum value is FE0C, the maximum value is 01F4. +For the deadband, the minimum value is 0, the max is 03E8. + +Controls +-------- + +:: + + OP= 41 + LEN= 03 + 00 Channel + 01 Start/Stop + Val 00: Stop + Val 01: Start and play once. + Val 41: Start and play n times (See byte 02 below) + 02 Number of iterations n. + +Init +---- + + +Querying features +^^^^^^^^^^^^^^^^^ +:: + + OP= ff + Query command. Length varies according to the query type. + The general format of this packet is: + ff 01 QUERY [INDEX] CHECKSUM + responses are of the same form: + FF LEN QUERY VALUE_QUERIED CHECKSUM2 + where LEN = 1 + length(VALUE_QUERIED) + +Query ram size +~~~~~~~~~~~~~~ + +:: + + QUERY = 42 ('B'uffer size) + +The device should reply with the same packet plus two additional bytes +containing the size of the memory: +ff 03 42 03 e8 CS would mean that the device has 1000 bytes of ram available. + +Query number of effects +~~~~~~~~~~~~~~~~~~~~~~~ + +:: + + QUERY = 4e ('N'umber of effects) + +The device should respond by sending the number of effects that can be played +at the same time (one byte) +ff 02 4e 14 CS would stand for 20 effects. + +Vendor's id +~~~~~~~~~~~ + +:: + + QUERY = 4d ('M'anufacturer) + +Query the vendors'id (2 bytes) + +Product id +~~~~~~~~~~ + +:: + + QUERY = 50 ('P'roduct) + +Query the product id (2 bytes) + +Open device +~~~~~~~~~~~ + +:: + + QUERY = 4f ('O'pen) + +No data returned. + +Close device +~~~~~~~~~~~~ + +:: + + QUERY = 43 ('C')lose + +No data returned. + +Query effect +~~~~~~~~~~~~ + +:: + + QUERY = 45 ('E') + +Send effect type. +Returns nonzero if supported (2 bytes) + +Firmware Version +~~~~~~~~~~~~~~~~ + +:: + + QUERY = 56 ('V'ersion) + +Sends back 3 bytes - major, minor, subminor + +Initialisation of the device +^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Set Control +~~~~~~~~~~~ + +.. note:: + Device dependent, can be different on different models! + +:: + + OP= 40 [] + LEN= 2 or 3 + 00 Idx + Idx 00 Set dead zone (0..2048) + Idx 01 Ignore Deadman sensor (0..1) + Idx 02 Enable comm watchdog (0..1) + Idx 03 Set the strength of the spring (0..100) + Idx 04 Enable or disable the spring (0/1) + Idx 05 Set axis saturation threshold (0..2048) + +Set Effect State +~~~~~~~~~~~~~~~~ + +:: + + OP= 42 + LEN= 1 + 00 State + Bit 3 Pause force feedback + Bit 2 Enable force feedback + Bit 0 Stop all effects + +Set overall +~~~~~~~~~~~ + +:: + + OP= 43 + LEN= 1 + 00 Gain + Val 00 = 0% + Val 40 = 50% + Val 80 = 100% + +Parameter memory +---------------- + +Each device has a certain amount of memory to store parameters of effects. +The amount of RAM may vary, I encountered values from 200 to 1000 bytes. Below +is the amount of memory apparently needed for every set of parameters: + + - period : 0c + - magnitude : 02 + - attack and fade : 0e + - interactive : 08 + +Appendix: How to study the protocol? +==================================== + +1. Generate effects using the force editor provided with the DirectX SDK, or +use Immersion Studio (freely available at their web site in the developer section: +www.immersion.com) +2. Start a soft spying RS232 or USB (depending on where you connected your +joystick/wheel). I used ComPortSpy from fCoder (alpha version!) +3. Play the effect, and watch what happens on the spy screen. + +A few words about ComPortSpy: +At first glance, this software seems, hum, well... buggy. In fact, data appear with a +few seconds latency. Personally, I restart it every time I play an effect. +Remember it's free (as in free beer) and alpha! + +URLS +==== + +Check http://www.immerse.com for Immersion Studio, +and http://www.fcoder.com for ComPortSpy. + + +I-Force is trademark of Immersion Corp. -- cgit v1.2.3