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/hid/hid-roccat.c | 461 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 461 insertions(+) create mode 100644 drivers/hid/hid-roccat.c (limited to 'drivers/hid/hid-roccat.c') diff --git a/drivers/hid/hid-roccat.c b/drivers/hid/hid-roccat.c new file mode 100644 index 000000000..6da80e442 --- /dev/null +++ b/drivers/hid/hid-roccat.c @@ -0,0 +1,461 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Roccat driver for Linux + * + * Copyright (c) 2010 Stefan Achatz + */ + +/* + */ + +/* + * Module roccat is a char device used to report special events of roccat + * hardware to userland. These events include requests for on-screen-display of + * profile or dpi settings or requests for execution of macro sequences that are + * not stored in device. The information in these events depends on hid device + * implementation and contains data that is not available in a single hid event + * or else hidraw could have been used. + * It is inspired by hidraw, but uses only one circular buffer for all readers. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include + +#define ROCCAT_FIRST_MINOR 0 +#define ROCCAT_MAX_DEVICES 8 + +/* should be a power of 2 for performance reason */ +#define ROCCAT_CBUF_SIZE 16 + +struct roccat_report { + uint8_t *value; +}; + +struct roccat_device { + unsigned int minor; + int report_size; + int open; + int exist; + wait_queue_head_t wait; + struct device *dev; + struct hid_device *hid; + struct list_head readers; + /* protects modifications of readers list */ + struct mutex readers_lock; + + /* + * circular_buffer has one writer and multiple readers with their own + * read pointers + */ + struct roccat_report cbuf[ROCCAT_CBUF_SIZE]; + int cbuf_end; + struct mutex cbuf_lock; +}; + +struct roccat_reader { + struct list_head node; + struct roccat_device *device; + int cbuf_start; +}; + +static int roccat_major; +static struct cdev roccat_cdev; + +static struct roccat_device *devices[ROCCAT_MAX_DEVICES]; +/* protects modifications of devices array */ +static DEFINE_MUTEX(devices_lock); + +static ssize_t roccat_read(struct file *file, char __user *buffer, + size_t count, loff_t *ppos) +{ + struct roccat_reader *reader = file->private_data; + struct roccat_device *device = reader->device; + struct roccat_report *report; + ssize_t retval = 0, len; + DECLARE_WAITQUEUE(wait, current); + + mutex_lock(&device->cbuf_lock); + + /* no data? */ + if (reader->cbuf_start == device->cbuf_end) { + add_wait_queue(&device->wait, &wait); + set_current_state(TASK_INTERRUPTIBLE); + + /* wait for data */ + while (reader->cbuf_start == device->cbuf_end) { + if (file->f_flags & O_NONBLOCK) { + retval = -EAGAIN; + break; + } + if (signal_pending(current)) { + retval = -ERESTARTSYS; + break; + } + if (!device->exist) { + retval = -EIO; + break; + } + + mutex_unlock(&device->cbuf_lock); + schedule(); + mutex_lock(&device->cbuf_lock); + set_current_state(TASK_INTERRUPTIBLE); + } + + set_current_state(TASK_RUNNING); + remove_wait_queue(&device->wait, &wait); + } + + /* here we either have data or a reason to return if retval is set */ + if (retval) + goto exit_unlock; + + report = &device->cbuf[reader->cbuf_start]; + /* + * If report is larger than requested amount of data, rest of report + * is lost! + */ + len = device->report_size > count ? count : device->report_size; + + if (copy_to_user(buffer, report->value, len)) { + retval = -EFAULT; + goto exit_unlock; + } + retval += len; + reader->cbuf_start = (reader->cbuf_start + 1) % ROCCAT_CBUF_SIZE; + +exit_unlock: + mutex_unlock(&device->cbuf_lock); + return retval; +} + +static __poll_t roccat_poll(struct file *file, poll_table *wait) +{ + struct roccat_reader *reader = file->private_data; + poll_wait(file, &reader->device->wait, wait); + if (reader->cbuf_start != reader->device->cbuf_end) + return EPOLLIN | EPOLLRDNORM; + if (!reader->device->exist) + return EPOLLERR | EPOLLHUP; + return 0; +} + +static int roccat_open(struct inode *inode, struct file *file) +{ + unsigned int minor = iminor(inode); + struct roccat_reader *reader; + struct roccat_device *device; + int error = 0; + + reader = kzalloc(sizeof(struct roccat_reader), GFP_KERNEL); + if (!reader) + return -ENOMEM; + + mutex_lock(&devices_lock); + + device = devices[minor]; + + if (!device) { + pr_emerg("roccat device with minor %d doesn't exist\n", minor); + error = -ENODEV; + goto exit_err_devices; + } + + mutex_lock(&device->readers_lock); + + if (!device->open++) { + /* power on device on adding first reader */ + error = hid_hw_power(device->hid, PM_HINT_FULLON); + if (error < 0) { + --device->open; + goto exit_err_readers; + } + + error = hid_hw_open(device->hid); + if (error < 0) { + hid_hw_power(device->hid, PM_HINT_NORMAL); + --device->open; + goto exit_err_readers; + } + } + + reader->device = device; + /* new reader doesn't get old events */ + reader->cbuf_start = device->cbuf_end; + + list_add_tail(&reader->node, &device->readers); + file->private_data = reader; + +exit_err_readers: + mutex_unlock(&device->readers_lock); +exit_err_devices: + mutex_unlock(&devices_lock); + if (error) + kfree(reader); + return error; +} + +static int roccat_release(struct inode *inode, struct file *file) +{ + unsigned int minor = iminor(inode); + struct roccat_reader *reader = file->private_data; + struct roccat_device *device; + + mutex_lock(&devices_lock); + + device = devices[minor]; + if (!device) { + mutex_unlock(&devices_lock); + pr_emerg("roccat device with minor %d doesn't exist\n", minor); + return -ENODEV; + } + + mutex_lock(&device->readers_lock); + list_del(&reader->node); + mutex_unlock(&device->readers_lock); + kfree(reader); + + if (!--device->open) { + /* removing last reader */ + if (device->exist) { + hid_hw_power(device->hid, PM_HINT_NORMAL); + hid_hw_close(device->hid); + } else { + kfree(device); + } + } + + mutex_unlock(&devices_lock); + + return 0; +} + +/* + * roccat_report_event() - output data to readers + * @minor: minor device number returned by roccat_connect() + * @data: pointer to data + * + * Return value is zero on success, a negative error code on failure. + * + * This is called from interrupt handler. + */ +int roccat_report_event(int minor, u8 const *data) +{ + struct roccat_device *device; + struct roccat_reader *reader; + struct roccat_report *report; + uint8_t *new_value; + + device = devices[minor]; + + new_value = kmemdup(data, device->report_size, GFP_ATOMIC); + if (!new_value) + return -ENOMEM; + + mutex_lock(&device->cbuf_lock); + + report = &device->cbuf[device->cbuf_end]; + + /* passing NULL is safe */ + kfree(report->value); + + report->value = new_value; + device->cbuf_end = (device->cbuf_end + 1) % ROCCAT_CBUF_SIZE; + + list_for_each_entry(reader, &device->readers, node) { + /* + * As we already inserted one element, the buffer can't be + * empty. If start and end are equal, buffer is full and we + * increase start, so that slow reader misses one event, but + * gets the newer ones in the right order. + */ + if (reader->cbuf_start == device->cbuf_end) + reader->cbuf_start = (reader->cbuf_start + 1) % ROCCAT_CBUF_SIZE; + } + + mutex_unlock(&device->cbuf_lock); + + wake_up_interruptible(&device->wait); + return 0; +} +EXPORT_SYMBOL_GPL(roccat_report_event); + +/* + * roccat_connect() - create a char device for special event output + * @class: the class thats used to create the device. Meant to hold device + * specific sysfs attributes. + * @hid: the hid device the char device should be connected to. + * @report_size: size of reports + * + * Return value is minor device number in Range [0, ROCCAT_MAX_DEVICES] on + * success, a negative error code on failure. + */ +int roccat_connect(struct class *klass, struct hid_device *hid, int report_size) +{ + unsigned int minor; + struct roccat_device *device; + int temp; + + device = kzalloc(sizeof(struct roccat_device), GFP_KERNEL); + if (!device) + return -ENOMEM; + + mutex_lock(&devices_lock); + + for (minor = 0; minor < ROCCAT_MAX_DEVICES; ++minor) { + if (devices[minor]) + continue; + break; + } + + if (minor < ROCCAT_MAX_DEVICES) { + devices[minor] = device; + } else { + mutex_unlock(&devices_lock); + kfree(device); + return -EINVAL; + } + + device->dev = device_create(klass, &hid->dev, + MKDEV(roccat_major, minor), NULL, + "%s%s%d", "roccat", hid->driver->name, minor); + + if (IS_ERR(device->dev)) { + devices[minor] = NULL; + mutex_unlock(&devices_lock); + temp = PTR_ERR(device->dev); + kfree(device); + return temp; + } + + mutex_unlock(&devices_lock); + + init_waitqueue_head(&device->wait); + INIT_LIST_HEAD(&device->readers); + mutex_init(&device->readers_lock); + mutex_init(&device->cbuf_lock); + device->minor = minor; + device->hid = hid; + device->exist = 1; + device->cbuf_end = 0; + device->report_size = report_size; + + return minor; +} +EXPORT_SYMBOL_GPL(roccat_connect); + +/* roccat_disconnect() - remove char device from hid device + * @minor: the minor device number returned by roccat_connect() + */ +void roccat_disconnect(int minor) +{ + struct roccat_device *device; + + mutex_lock(&devices_lock); + device = devices[minor]; + mutex_unlock(&devices_lock); + + device->exist = 0; /* TODO exist maybe not needed */ + + device_destroy(device->dev->class, MKDEV(roccat_major, minor)); + + mutex_lock(&devices_lock); + devices[minor] = NULL; + mutex_unlock(&devices_lock); + + if (device->open) { + hid_hw_close(device->hid); + wake_up_interruptible(&device->wait); + } else { + kfree(device); + } +} +EXPORT_SYMBOL_GPL(roccat_disconnect); + +static long roccat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + struct inode *inode = file_inode(file); + struct roccat_device *device; + unsigned int minor = iminor(inode); + long retval = 0; + + mutex_lock(&devices_lock); + + device = devices[minor]; + if (!device) { + retval = -ENODEV; + goto out; + } + + switch (cmd) { + case ROCCATIOCGREPSIZE: + if (put_user(device->report_size, (int __user *)arg)) + retval = -EFAULT; + break; + default: + retval = -ENOTTY; + } +out: + mutex_unlock(&devices_lock); + return retval; +} + +static const struct file_operations roccat_ops = { + .owner = THIS_MODULE, + .read = roccat_read, + .poll = roccat_poll, + .open = roccat_open, + .release = roccat_release, + .llseek = noop_llseek, + .unlocked_ioctl = roccat_ioctl, +}; + +static int __init roccat_init(void) +{ + int retval; + dev_t dev_id; + + retval = alloc_chrdev_region(&dev_id, ROCCAT_FIRST_MINOR, + ROCCAT_MAX_DEVICES, "roccat"); + if (retval < 0) { + pr_warn("can't get major number\n"); + goto error; + } + + roccat_major = MAJOR(dev_id); + + cdev_init(&roccat_cdev, &roccat_ops); + retval = cdev_add(&roccat_cdev, dev_id, ROCCAT_MAX_DEVICES); + + if (retval < 0) { + pr_warn("cannot add cdev\n"); + goto cleanup_alloc_chrdev_region; + } + return 0; + + + cleanup_alloc_chrdev_region: + unregister_chrdev_region(dev_id, ROCCAT_MAX_DEVICES); + error: + return retval; +} + +static void __exit roccat_exit(void) +{ + dev_t dev_id = MKDEV(roccat_major, 0); + + cdev_del(&roccat_cdev); + unregister_chrdev_region(dev_id, ROCCAT_MAX_DEVICES); +} + +module_init(roccat_init); +module_exit(roccat_exit); + +MODULE_AUTHOR("Stefan Achatz"); +MODULE_DESCRIPTION("USB Roccat char device"); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3