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/hwmon/hih6130.c | 260 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 260 insertions(+) create mode 100644 drivers/hwmon/hih6130.c (limited to 'drivers/hwmon/hih6130.c') diff --git a/drivers/hwmon/hih6130.c b/drivers/hwmon/hih6130.c new file mode 100644 index 000000000..d9394e19f --- /dev/null +++ b/drivers/hwmon/hih6130.c @@ -0,0 +1,260 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Honeywell HIH-6130/HIH-6131 humidity and temperature sensor driver + * + * Copyright (C) 2012 Iain Paton + * + * heavily based on the sht21 driver + * Copyright (C) 2010 Urs Fleisch + * + * Data sheets available (2012-06-22) at + * http://sensing.honeywell.com/index.php?ci_id=3106&la_id=1&defId=44872 + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/** + * struct hih6130 - HIH-6130 device specific data + * @client: pointer to I2C client device + * @lock: mutex to protect measurement values + * @valid: only false before first measurement is taken + * @last_update: time of last update (jiffies) + * @temperature: cached temperature measurement value + * @humidity: cached humidity measurement value + * @write_length: length for I2C measurement request + */ +struct hih6130 { + struct i2c_client *client; + struct mutex lock; + bool valid; + unsigned long last_update; + int temperature; + int humidity; + size_t write_length; +}; + +/** + * hih6130_temp_ticks_to_millicelsius() - convert raw temperature ticks to + * milli celsius + * @ticks: temperature ticks value received from sensor + */ +static inline int hih6130_temp_ticks_to_millicelsius(int ticks) +{ + ticks = ticks >> 2; + /* + * from data sheet section 5.0 + * Formula T = ( ticks / ( 2^14 - 2 ) ) * 165 -40 + */ + return (DIV_ROUND_CLOSEST(ticks * 1650, 16382) - 400) * 100; +} + +/** + * hih6130_rh_ticks_to_per_cent_mille() - convert raw humidity ticks to + * one-thousandths of a percent relative humidity + * @ticks: humidity ticks value received from sensor + */ +static inline int hih6130_rh_ticks_to_per_cent_mille(int ticks) +{ + ticks &= ~0xC000; /* clear status bits */ + /* + * from data sheet section 4.0 + * Formula RH = ( ticks / ( 2^14 -2 ) ) * 100 + */ + return DIV_ROUND_CLOSEST(ticks * 1000, 16382) * 100; +} + +/** + * hih6130_update_measurements() - get updated measurements from device + * @dev: device + * + * Returns 0 on success, else negative errno. + */ +static int hih6130_update_measurements(struct device *dev) +{ + struct hih6130 *hih6130 = dev_get_drvdata(dev); + struct i2c_client *client = hih6130->client; + int ret = 0; + int t; + unsigned char tmp[4]; + struct i2c_msg msgs[1] = { + { + .addr = client->addr, + .flags = I2C_M_RD, + .len = 4, + .buf = tmp, + } + }; + + mutex_lock(&hih6130->lock); + + /* + * While the measurement can be completed in ~40ms the sensor takes + * much longer to react to a change in external conditions. How quickly + * it reacts depends on airflow and other factors outwith our control. + * The datasheet specifies maximum 'Response time' for humidity at 8s + * and temperature at 30s under specified conditions. + * We therefore choose to only read the sensor at most once per second. + * This trades off pointless activity polling the sensor much faster + * than it can react against better response times in conditions more + * favourable than specified in the datasheet. + */ + if (time_after(jiffies, hih6130->last_update + HZ) || !hih6130->valid) { + + /* + * Write to slave address to request a measurement. + * According with the datasheet it should be with no data, but + * for systems with I2C bus drivers that do not allow zero + * length packets we write one dummy byte to allow sensor + * measurements on them. + */ + tmp[0] = 0; + ret = i2c_master_send(client, tmp, hih6130->write_length); + if (ret < 0) + goto out; + + /* measurement cycle time is ~36.65msec */ + msleep(40); + + ret = i2c_transfer(client->adapter, msgs, 1); + if (ret < 0) + goto out; + + if ((tmp[0] & 0xC0) != 0) { + dev_err(&client->dev, "Error while reading measurement result\n"); + ret = -EIO; + goto out; + } + + t = (tmp[0] << 8) + tmp[1]; + hih6130->humidity = hih6130_rh_ticks_to_per_cent_mille(t); + + t = (tmp[2] << 8) + tmp[3]; + hih6130->temperature = hih6130_temp_ticks_to_millicelsius(t); + + hih6130->last_update = jiffies; + hih6130->valid = true; + } +out: + mutex_unlock(&hih6130->lock); + + return ret >= 0 ? 0 : ret; +} + +/** + * hih6130_show_temperature() - show temperature measurement value in sysfs + * @dev: device + * @attr: device attribute + * @buf: sysfs buffer (PAGE_SIZE) where measurement values are written to + * + * Will be called on read access to temp1_input sysfs attribute. + * Returns number of bytes written into buffer, negative errno on error. + */ +static ssize_t hih6130_temperature_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct hih6130 *hih6130 = dev_get_drvdata(dev); + int ret; + + ret = hih6130_update_measurements(dev); + if (ret < 0) + return ret; + return sprintf(buf, "%d\n", hih6130->temperature); +} + +/** + * hih6130_show_humidity() - show humidity measurement value in sysfs + * @dev: device + * @attr: device attribute + * @buf: sysfs buffer (PAGE_SIZE) where measurement values are written to + * + * Will be called on read access to humidity1_input sysfs attribute. + * Returns number of bytes written into buffer, negative errno on error. + */ +static ssize_t hih6130_humidity_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct hih6130 *hih6130 = dev_get_drvdata(dev); + int ret; + + ret = hih6130_update_measurements(dev); + if (ret < 0) + return ret; + return sprintf(buf, "%d\n", hih6130->humidity); +} + +/* sysfs attributes */ +static SENSOR_DEVICE_ATTR_RO(temp1_input, hih6130_temperature, 0); +static SENSOR_DEVICE_ATTR_RO(humidity1_input, hih6130_humidity, 0); + +static struct attribute *hih6130_attrs[] = { + &sensor_dev_attr_temp1_input.dev_attr.attr, + &sensor_dev_attr_humidity1_input.dev_attr.attr, + NULL +}; + +ATTRIBUTE_GROUPS(hih6130); + +static int hih6130_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct hih6130 *hih6130; + struct device *hwmon_dev; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { + dev_err(&client->dev, "adapter does not support true I2C\n"); + return -ENODEV; + } + + hih6130 = devm_kzalloc(dev, sizeof(*hih6130), GFP_KERNEL); + if (!hih6130) + return -ENOMEM; + + hih6130->client = client; + mutex_init(&hih6130->lock); + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_QUICK)) + hih6130->write_length = 1; + + hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, + hih6130, + hih6130_groups); + return PTR_ERR_OR_ZERO(hwmon_dev); +} + +/* Device ID table */ +static const struct i2c_device_id hih6130_id[] = { + { "hih6130", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, hih6130_id); + +static const struct of_device_id __maybe_unused hih6130_of_match[] = { + { .compatible = "honeywell,hih6130", }, + { } +}; +MODULE_DEVICE_TABLE(of, hih6130_of_match); + +static struct i2c_driver hih6130_driver = { + .driver = { + .name = "hih6130", + .of_match_table = of_match_ptr(hih6130_of_match), + }, + .probe_new = hih6130_probe, + .id_table = hih6130_id, +}; + +module_i2c_driver(hih6130_driver); + +MODULE_AUTHOR("Iain Paton "); +MODULE_DESCRIPTION("Honeywell HIH-6130 humidity and temperature sensor driver"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3