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author | 2023-02-21 18:24:12 -0800 | |
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committer | 2023-02-21 18:24:12 -0800 | |
commit | 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 (patch) | |
tree | cc5c2d0a898769fd59549594fedb3ee6f84e59a0 /drivers/char/nwbutton.c | |
download | linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.tar.gz linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.zip |
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().
...
Diffstat (limited to 'drivers/char/nwbutton.c')
-rw-r--r-- | drivers/char/nwbutton.c | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/drivers/char/nwbutton.c b/drivers/char/nwbutton.c new file mode 100644 index 000000000..ea378c0ed --- /dev/null +++ b/drivers/char/nwbutton.c @@ -0,0 +1,247 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * NetWinder Button Driver- + * Copyright (C) Alex Holden <alex@linuxhacker.org> 1998, 1999. + * + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/sched/signal.h> +#include <linux/interrupt.h> +#include <linux/time.h> +#include <linux/timer.h> +#include <linux/fs.h> +#include <linux/miscdevice.h> +#include <linux/string.h> +#include <linux/errno.h> +#include <linux/init.h> + +#include <linux/uaccess.h> +#include <asm/irq.h> +#include <asm/mach-types.h> + +#define __NWBUTTON_C /* Tell the header file who we are */ +#include "nwbutton.h" + +static void button_sequence_finished(struct timer_list *unused); + +static int button_press_count; /* The count of button presses */ +/* Times for the end of a sequence */ +static DEFINE_TIMER(button_timer, button_sequence_finished); +static DECLARE_WAIT_QUEUE_HEAD(button_wait_queue); /* Used for blocking read */ +static char button_output_buffer[32]; /* Stores data to write out of device */ +static int bcount; /* The number of bytes in the buffer */ +static int bdelay = BUTTON_DELAY; /* The delay, in jiffies */ +static struct button_callback button_callback_list[32]; /* The callback list */ +static int callback_count; /* The number of callbacks registered */ +static int reboot_count = NUM_PRESSES_REBOOT; /* Number of presses to reboot */ + +/* + * This function is called by other drivers to register a callback function + * to be called when a particular number of button presses occurs. + * The callback list is a static array of 32 entries (I somehow doubt many + * people are ever going to want to register more than 32 different actions + * to be performed by the kernel on different numbers of button presses ;). + * However, if an attempt to register a 33rd entry (perhaps a stuck loop + * somewhere registering the same entry over and over?) it will fail to + * do so and return -ENOMEM. If an attempt is made to register a null pointer, + * it will fail to do so and return -EINVAL. + * Because callbacks can be unregistered at random the list can become + * fragmented, so we need to search through the list until we find the first + * free entry. + * + * FIXME: Has anyone spotted any locking functions int his code recently ?? + */ + +int button_add_callback (void (*callback) (void), int count) +{ + int lp = 0; + if (callback_count == 32) { + return -ENOMEM; + } + if (!callback) { + return -EINVAL; + } + callback_count++; + for (; (button_callback_list [lp].callback); lp++); + button_callback_list [lp].callback = callback; + button_callback_list [lp].count = count; + return 0; +} + +/* + * This function is called by other drivers to deregister a callback function. + * If you attempt to unregister a callback which does not exist, it will fail + * with -EINVAL. If there is more than one entry with the same address, + * because it searches the list from end to beginning, it will unregister the + * last one to be registered first (FILO- First In Last Out). + * Note that this is not necessarily true if the entries are not submitted + * at the same time, because another driver could have unregistered a callback + * between the submissions creating a gap earlier in the list, which would + * be filled first at submission time. + */ + +int button_del_callback (void (*callback) (void)) +{ + int lp = 31; + if (!callback) { + return -EINVAL; + } + while (lp >= 0) { + if ((button_callback_list [lp].callback) == callback) { + button_callback_list [lp].callback = NULL; + button_callback_list [lp].count = 0; + callback_count--; + return 0; + } + lp--; + } + return -EINVAL; +} + +/* + * This function is called by button_sequence_finished to search through the + * list of callback functions, and call any of them whose count argument + * matches the current count of button presses. It starts at the beginning + * of the list and works up to the end. It will refuse to follow a null + * pointer (which should never happen anyway). + */ + +static void button_consume_callbacks (int bpcount) +{ + int lp = 0; + for (; lp <= 31; lp++) { + if ((button_callback_list [lp].count) == bpcount) { + if (button_callback_list [lp].callback) { + button_callback_list[lp].callback(); + } + } + } +} + +/* + * This function is called when the button_timer times out. + * ie. When you don't press the button for bdelay jiffies, this is taken to + * mean you have ended the sequence of key presses, and this function is + * called to wind things up (write the press_count out to /dev/button, call + * any matching registered function callbacks, initiate reboot, etc.). + */ + +static void button_sequence_finished(struct timer_list *unused) +{ + if (IS_ENABLED(CONFIG_NWBUTTON_REBOOT) && + button_press_count == reboot_count) + kill_cad_pid(SIGINT, 1); /* Ask init to reboot us */ + button_consume_callbacks (button_press_count); + bcount = sprintf (button_output_buffer, "%d\n", button_press_count); + button_press_count = 0; /* Reset the button press counter */ + wake_up_interruptible (&button_wait_queue); +} + +/* + * This handler is called when the orange button is pressed (GPIO 10 of the + * SuperIO chip, which maps to logical IRQ 26). If the press_count is 0, + * this is the first press, so it starts a timer and increments the counter. + * If it is higher than 0, it deletes the old timer, starts a new one, and + * increments the counter. + */ + +static irqreturn_t button_handler (int irq, void *dev_id) +{ + button_press_count++; + mod_timer(&button_timer, jiffies + bdelay); + + return IRQ_HANDLED; +} + +/* + * This function is called when a user space program attempts to read + * /dev/nwbutton. It puts the device to sleep on the wait queue until + * button_sequence_finished writes some data to the buffer and flushes + * the queue, at which point it writes the data out to the device and + * returns the number of characters it has written. This function is + * reentrant, so that many processes can be attempting to read from the + * device at any one time. + */ + +static int button_read (struct file *filp, char __user *buffer, + size_t count, loff_t *ppos) +{ + DEFINE_WAIT(wait); + prepare_to_wait(&button_wait_queue, &wait, TASK_INTERRUPTIBLE); + schedule(); + finish_wait(&button_wait_queue, &wait); + return (copy_to_user (buffer, &button_output_buffer, bcount)) + ? -EFAULT : bcount; +} + +/* + * This structure is the file operations structure, which specifies what + * callbacks functions the kernel should call when a user mode process + * attempts to perform these operations on the device. + */ + +static const struct file_operations button_fops = { + .owner = THIS_MODULE, + .read = button_read, + .llseek = noop_llseek, +}; + +/* + * This structure is the misc device structure, which specifies the minor + * device number (158 in this case), the name of the device (for /proc/misc), + * and the address of the above file operations structure. + */ + +static struct miscdevice button_misc_device = { + BUTTON_MINOR, + "nwbutton", + &button_fops, +}; + +/* + * This function is called to initialise the driver, either from misc.c at + * bootup if the driver is compiled into the kernel, or from init_module + * below at module insert time. It attempts to register the device node + * and the IRQ and fails with a warning message if either fails, though + * neither ever should because the device number and IRQ are unique to + * this driver. + */ + +static int __init nwbutton_init(void) +{ + if (!machine_is_netwinder()) + return -ENODEV; + + printk (KERN_INFO "NetWinder Button Driver Version %s (C) Alex Holden " + "<alex@linuxhacker.org> 1998.\n", VERSION); + + if (misc_register (&button_misc_device)) { + printk (KERN_WARNING "nwbutton: Couldn't register device 10, " + "%d.\n", BUTTON_MINOR); + return -EBUSY; + } + + if (request_irq (IRQ_NETWINDER_BUTTON, button_handler, 0, + "nwbutton", NULL)) { + printk (KERN_WARNING "nwbutton: IRQ %d is not free.\n", + IRQ_NETWINDER_BUTTON); + misc_deregister (&button_misc_device); + return -EIO; + } + return 0; +} + +static void __exit nwbutton_exit (void) +{ + free_irq (IRQ_NETWINDER_BUTTON, NULL); + misc_deregister (&button_misc_device); +} + + +MODULE_AUTHOR("Alex Holden"); +MODULE_LICENSE("GPL"); + +module_init(nwbutton_init); +module_exit(nwbutton_exit); |