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(). ... --- drivers/input/misc/rotary_encoder.c | 370 ++++++++++++++++++++++++++++++++++++ 1 file changed, 370 insertions(+) create mode 100644 drivers/input/misc/rotary_encoder.c (limited to 'drivers/input/misc/rotary_encoder.c') diff --git a/drivers/input/misc/rotary_encoder.c b/drivers/input/misc/rotary_encoder.c new file mode 100644 index 000000000..6d613f2a0 --- /dev/null +++ b/drivers/input/misc/rotary_encoder.c @@ -0,0 +1,370 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * rotary_encoder.c + * + * (c) 2009 Daniel Mack + * Copyright (C) 2011 Johan Hovold + * + * state machine code inspired by code from Tim Ruetz + * + * A generic driver for rotary encoders connected to GPIO lines. + * See file:Documentation/input/devices/rotary-encoder.rst for more information + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define DRV_NAME "rotary-encoder" + +enum rotary_encoder_encoding { + ROTENC_GRAY, + ROTENC_BINARY, +}; + +struct rotary_encoder { + struct input_dev *input; + + struct mutex access_mutex; + + u32 steps; + u32 axis; + bool relative_axis; + bool rollover; + enum rotary_encoder_encoding encoding; + + unsigned int pos; + + struct gpio_descs *gpios; + + unsigned int *irq; + + bool armed; + signed char dir; /* 1 - clockwise, -1 - CCW */ + + unsigned int last_stable; +}; + +static unsigned int rotary_encoder_get_state(struct rotary_encoder *encoder) +{ + int i; + unsigned int ret = 0; + + for (i = 0; i < encoder->gpios->ndescs; ++i) { + int val = gpiod_get_value_cansleep(encoder->gpios->desc[i]); + + /* convert from gray encoding to normal */ + if (encoder->encoding == ROTENC_GRAY && ret & 1) + val = !val; + + ret = ret << 1 | val; + } + + return ret & 3; +} + +static void rotary_encoder_report_event(struct rotary_encoder *encoder) +{ + if (encoder->relative_axis) { + input_report_rel(encoder->input, + encoder->axis, encoder->dir); + } else { + unsigned int pos = encoder->pos; + + if (encoder->dir < 0) { + /* turning counter-clockwise */ + if (encoder->rollover) + pos += encoder->steps; + if (pos) + pos--; + } else { + /* turning clockwise */ + if (encoder->rollover || pos < encoder->steps) + pos++; + } + + if (encoder->rollover) + pos %= encoder->steps; + + encoder->pos = pos; + input_report_abs(encoder->input, encoder->axis, encoder->pos); + } + + input_sync(encoder->input); +} + +static irqreturn_t rotary_encoder_irq(int irq, void *dev_id) +{ + struct rotary_encoder *encoder = dev_id; + unsigned int state; + + mutex_lock(&encoder->access_mutex); + + state = rotary_encoder_get_state(encoder); + + switch (state) { + case 0x0: + if (encoder->armed) { + rotary_encoder_report_event(encoder); + encoder->armed = false; + } + break; + + case 0x1: + case 0x3: + if (encoder->armed) + encoder->dir = 2 - state; + break; + + case 0x2: + encoder->armed = true; + break; + } + + mutex_unlock(&encoder->access_mutex); + + return IRQ_HANDLED; +} + +static irqreturn_t rotary_encoder_half_period_irq(int irq, void *dev_id) +{ + struct rotary_encoder *encoder = dev_id; + unsigned int state; + + mutex_lock(&encoder->access_mutex); + + state = rotary_encoder_get_state(encoder); + + if (state & 1) { + encoder->dir = ((encoder->last_stable - state + 1) % 4) - 1; + } else { + if (state != encoder->last_stable) { + rotary_encoder_report_event(encoder); + encoder->last_stable = state; + } + } + + mutex_unlock(&encoder->access_mutex); + + return IRQ_HANDLED; +} + +static irqreturn_t rotary_encoder_quarter_period_irq(int irq, void *dev_id) +{ + struct rotary_encoder *encoder = dev_id; + unsigned int state; + + mutex_lock(&encoder->access_mutex); + + state = rotary_encoder_get_state(encoder); + + if ((encoder->last_stable + 1) % 4 == state) + encoder->dir = 1; + else if (encoder->last_stable == (state + 1) % 4) + encoder->dir = -1; + else + goto out; + + rotary_encoder_report_event(encoder); + +out: + encoder->last_stable = state; + mutex_unlock(&encoder->access_mutex); + + return IRQ_HANDLED; +} + +static int rotary_encoder_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct rotary_encoder *encoder; + struct input_dev *input; + irq_handler_t handler; + u32 steps_per_period; + unsigned int i; + int err; + + encoder = devm_kzalloc(dev, sizeof(struct rotary_encoder), GFP_KERNEL); + if (!encoder) + return -ENOMEM; + + mutex_init(&encoder->access_mutex); + + device_property_read_u32(dev, "rotary-encoder,steps", &encoder->steps); + + err = device_property_read_u32(dev, "rotary-encoder,steps-per-period", + &steps_per_period); + if (err) { + /* + * The 'half-period' property has been deprecated, you must + * use 'steps-per-period' and set an appropriate value, but + * we still need to parse it to maintain compatibility. If + * neither property is present we fall back to the one step + * per period behavior. + */ + steps_per_period = device_property_read_bool(dev, + "rotary-encoder,half-period") ? 2 : 1; + } + + encoder->rollover = + device_property_read_bool(dev, "rotary-encoder,rollover"); + + if (!device_property_present(dev, "rotary-encoder,encoding") || + !device_property_match_string(dev, "rotary-encoder,encoding", + "gray")) { + dev_info(dev, "gray"); + encoder->encoding = ROTENC_GRAY; + } else if (!device_property_match_string(dev, "rotary-encoder,encoding", + "binary")) { + dev_info(dev, "binary"); + encoder->encoding = ROTENC_BINARY; + } else { + dev_err(dev, "unknown encoding setting\n"); + return -EINVAL; + } + + device_property_read_u32(dev, "linux,axis", &encoder->axis); + encoder->relative_axis = + device_property_read_bool(dev, "rotary-encoder,relative-axis"); + + encoder->gpios = devm_gpiod_get_array(dev, NULL, GPIOD_IN); + if (IS_ERR(encoder->gpios)) { + err = PTR_ERR(encoder->gpios); + if (err != -EPROBE_DEFER) + dev_err(dev, "unable to get gpios: %d\n", err); + return err; + } + if (encoder->gpios->ndescs < 2) { + dev_err(dev, "not enough gpios found\n"); + return -EINVAL; + } + + input = devm_input_allocate_device(dev); + if (!input) + return -ENOMEM; + + encoder->input = input; + + input->name = pdev->name; + input->id.bustype = BUS_HOST; + input->dev.parent = dev; + + if (encoder->relative_axis) + input_set_capability(input, EV_REL, encoder->axis); + else + input_set_abs_params(input, + encoder->axis, 0, encoder->steps, 0, 1); + + switch (steps_per_period >> (encoder->gpios->ndescs - 2)) { + case 4: + handler = &rotary_encoder_quarter_period_irq; + encoder->last_stable = rotary_encoder_get_state(encoder); + break; + case 2: + handler = &rotary_encoder_half_period_irq; + encoder->last_stable = rotary_encoder_get_state(encoder); + break; + case 1: + handler = &rotary_encoder_irq; + break; + default: + dev_err(dev, "'%d' is not a valid steps-per-period value\n", + steps_per_period); + return -EINVAL; + } + + encoder->irq = + devm_kcalloc(dev, + encoder->gpios->ndescs, sizeof(*encoder->irq), + GFP_KERNEL); + if (!encoder->irq) + return -ENOMEM; + + for (i = 0; i < encoder->gpios->ndescs; ++i) { + encoder->irq[i] = gpiod_to_irq(encoder->gpios->desc[i]); + + err = devm_request_threaded_irq(dev, encoder->irq[i], + NULL, handler, + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | + IRQF_ONESHOT, + DRV_NAME, encoder); + if (err) { + dev_err(dev, "unable to request IRQ %d (gpio#%d)\n", + encoder->irq[i], i); + return err; + } + } + + err = input_register_device(input); + if (err) { + dev_err(dev, "failed to register input device\n"); + return err; + } + + device_init_wakeup(dev, + device_property_read_bool(dev, "wakeup-source")); + + platform_set_drvdata(pdev, encoder); + + return 0; +} + +static int __maybe_unused rotary_encoder_suspend(struct device *dev) +{ + struct rotary_encoder *encoder = dev_get_drvdata(dev); + unsigned int i; + + if (device_may_wakeup(dev)) { + for (i = 0; i < encoder->gpios->ndescs; ++i) + enable_irq_wake(encoder->irq[i]); + } + + return 0; +} + +static int __maybe_unused rotary_encoder_resume(struct device *dev) +{ + struct rotary_encoder *encoder = dev_get_drvdata(dev); + unsigned int i; + + if (device_may_wakeup(dev)) { + for (i = 0; i < encoder->gpios->ndescs; ++i) + disable_irq_wake(encoder->irq[i]); + } + + return 0; +} + +static SIMPLE_DEV_PM_OPS(rotary_encoder_pm_ops, + rotary_encoder_suspend, rotary_encoder_resume); + +#ifdef CONFIG_OF +static const struct of_device_id rotary_encoder_of_match[] = { + { .compatible = "rotary-encoder", }, + { }, +}; +MODULE_DEVICE_TABLE(of, rotary_encoder_of_match); +#endif + +static struct platform_driver rotary_encoder_driver = { + .probe = rotary_encoder_probe, + .driver = { + .name = DRV_NAME, + .pm = &rotary_encoder_pm_ops, + .of_match_table = of_match_ptr(rotary_encoder_of_match), + } +}; +module_platform_driver(rotary_encoder_driver); + +MODULE_ALIAS("platform:" DRV_NAME); +MODULE_DESCRIPTION("GPIO rotary encoder driver"); +MODULE_AUTHOR("Daniel Mack , Johan Hovold"); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3