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/char/ds1620.c | 424 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 424 insertions(+) create mode 100644 drivers/char/ds1620.c (limited to 'drivers/char/ds1620.c') diff --git a/drivers/char/ds1620.c b/drivers/char/ds1620.c new file mode 100644 index 000000000..cf89a9631 --- /dev/null +++ b/drivers/char/ds1620.c @@ -0,0 +1,424 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * linux/drivers/char/ds1620.c: Dallas Semiconductors DS1620 + * thermometer driver (as used in the Rebel.com NetWinder) + */ +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#ifdef CONFIG_PROC_FS +/* define for /proc interface */ +#define THERM_USE_PROC +#endif + +/* Definitions for DS1620 chip */ +#define THERM_START_CONVERT 0xee +#define THERM_RESET 0xaf +#define THERM_READ_CONFIG 0xac +#define THERM_READ_TEMP 0xaa +#define THERM_READ_TL 0xa2 +#define THERM_READ_TH 0xa1 +#define THERM_WRITE_CONFIG 0x0c +#define THERM_WRITE_TL 0x02 +#define THERM_WRITE_TH 0x01 + +#define CFG_CPU 2 +#define CFG_1SHOT 1 + +static DEFINE_MUTEX(ds1620_mutex); +static const char *fan_state[] = { "off", "on", "on (hardwired)" }; + +/* + * Start of NetWinder specifics + * Note! We have to hold the gpio lock with IRQs disabled over the + * whole of our transaction to the Dallas chip, since there is a + * chance that the WaveArtist driver could touch these bits to + * enable or disable the speaker. + */ +extern unsigned int system_rev; + +static inline void netwinder_ds1620_set_clk(int clk) +{ + nw_gpio_modify_op(GPIO_DSCLK, clk ? GPIO_DSCLK : 0); +} + +static inline void netwinder_ds1620_set_data(int dat) +{ + nw_gpio_modify_op(GPIO_DATA, dat ? GPIO_DATA : 0); +} + +static inline int netwinder_ds1620_get_data(void) +{ + return nw_gpio_read() & GPIO_DATA; +} + +static inline void netwinder_ds1620_set_data_dir(int dir) +{ + nw_gpio_modify_io(GPIO_DATA, dir ? GPIO_DATA : 0); +} + +static inline void netwinder_ds1620_reset(void) +{ + nw_cpld_modify(CPLD_DS_ENABLE, 0); + nw_cpld_modify(CPLD_DS_ENABLE, CPLD_DS_ENABLE); +} + +static inline void netwinder_lock(unsigned long *flags) +{ + raw_spin_lock_irqsave(&nw_gpio_lock, *flags); +} + +static inline void netwinder_unlock(unsigned long *flags) +{ + raw_spin_unlock_irqrestore(&nw_gpio_lock, *flags); +} + +static inline void netwinder_set_fan(int i) +{ + unsigned long flags; + + raw_spin_lock_irqsave(&nw_gpio_lock, flags); + nw_gpio_modify_op(GPIO_FAN, i ? GPIO_FAN : 0); + raw_spin_unlock_irqrestore(&nw_gpio_lock, flags); +} + +static inline int netwinder_get_fan(void) +{ + if ((system_rev & 0xf000) == 0x4000) + return FAN_ALWAYS_ON; + + return (nw_gpio_read() & GPIO_FAN) ? FAN_ON : FAN_OFF; +} + +/* + * End of NetWinder specifics + */ + +static void ds1620_send_bits(int nr, int value) +{ + int i; + + for (i = 0; i < nr; i++) { + netwinder_ds1620_set_data(value & 1); + netwinder_ds1620_set_clk(0); + udelay(1); + netwinder_ds1620_set_clk(1); + udelay(1); + + value >>= 1; + } +} + +static unsigned int ds1620_recv_bits(int nr) +{ + unsigned int value = 0, mask = 1; + int i; + + netwinder_ds1620_set_data(0); + + for (i = 0; i < nr; i++) { + netwinder_ds1620_set_clk(0); + udelay(1); + + if (netwinder_ds1620_get_data()) + value |= mask; + + mask <<= 1; + + netwinder_ds1620_set_clk(1); + udelay(1); + } + + return value; +} + +static void ds1620_out(int cmd, int bits, int value) +{ + unsigned long flags; + + netwinder_lock(&flags); + netwinder_ds1620_set_clk(1); + netwinder_ds1620_set_data_dir(0); + netwinder_ds1620_reset(); + + udelay(1); + + ds1620_send_bits(8, cmd); + if (bits) + ds1620_send_bits(bits, value); + + udelay(1); + + netwinder_ds1620_reset(); + netwinder_unlock(&flags); + + msleep(20); +} + +static unsigned int ds1620_in(int cmd, int bits) +{ + unsigned long flags; + unsigned int value; + + netwinder_lock(&flags); + netwinder_ds1620_set_clk(1); + netwinder_ds1620_set_data_dir(0); + netwinder_ds1620_reset(); + + udelay(1); + + ds1620_send_bits(8, cmd); + + netwinder_ds1620_set_data_dir(1); + value = ds1620_recv_bits(bits); + + netwinder_ds1620_reset(); + netwinder_unlock(&flags); + + return value; +} + +static int cvt_9_to_int(unsigned int val) +{ + if (val & 0x100) + val |= 0xfffffe00; + + return val; +} + +static void ds1620_write_state(struct therm *therm) +{ + ds1620_out(THERM_WRITE_CONFIG, 8, CFG_CPU); + ds1620_out(THERM_WRITE_TL, 9, therm->lo); + ds1620_out(THERM_WRITE_TH, 9, therm->hi); + ds1620_out(THERM_START_CONVERT, 0, 0); +} + +static void ds1620_read_state(struct therm *therm) +{ + therm->lo = cvt_9_to_int(ds1620_in(THERM_READ_TL, 9)); + therm->hi = cvt_9_to_int(ds1620_in(THERM_READ_TH, 9)); +} + +static int ds1620_open(struct inode *inode, struct file *file) +{ + return stream_open(inode, file); +} + +static ssize_t +ds1620_read(struct file *file, char __user *buf, size_t count, loff_t *ptr) +{ + signed int cur_temp; + signed char cur_temp_degF; + + cur_temp = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9)) >> 1; + + /* convert to Fahrenheit, as per wdt.c */ + cur_temp_degF = (cur_temp * 9) / 5 + 32; + + if (copy_to_user(buf, &cur_temp_degF, 1)) + return -EFAULT; + + return 1; +} + +static int +ds1620_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + struct therm therm; + union { + struct therm __user *therm; + int __user *i; + } uarg; + int i; + + uarg.i = (int __user *)arg; + + switch(cmd) { + case CMD_SET_THERMOSTATE: + case CMD_SET_THERMOSTATE2: + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (cmd == CMD_SET_THERMOSTATE) { + if (get_user(therm.hi, uarg.i)) + return -EFAULT; + therm.lo = therm.hi - 3; + } else { + if (copy_from_user(&therm, uarg.therm, sizeof(therm))) + return -EFAULT; + } + + therm.lo <<= 1; + therm.hi <<= 1; + + ds1620_write_state(&therm); + break; + + case CMD_GET_THERMOSTATE: + case CMD_GET_THERMOSTATE2: + ds1620_read_state(&therm); + + therm.lo >>= 1; + therm.hi >>= 1; + + if (cmd == CMD_GET_THERMOSTATE) { + if (put_user(therm.hi, uarg.i)) + return -EFAULT; + } else { + if (copy_to_user(uarg.therm, &therm, sizeof(therm))) + return -EFAULT; + } + break; + + case CMD_GET_TEMPERATURE: + case CMD_GET_TEMPERATURE2: + i = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9)); + + if (cmd == CMD_GET_TEMPERATURE) + i >>= 1; + + return put_user(i, uarg.i) ? -EFAULT : 0; + + case CMD_GET_STATUS: + i = ds1620_in(THERM_READ_CONFIG, 8) & 0xe3; + + return put_user(i, uarg.i) ? -EFAULT : 0; + + case CMD_GET_FAN: + i = netwinder_get_fan(); + + return put_user(i, uarg.i) ? -EFAULT : 0; + + case CMD_SET_FAN: + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (get_user(i, uarg.i)) + return -EFAULT; + + netwinder_set_fan(i); + break; + + default: + return -ENOIOCTLCMD; + } + + return 0; +} + +static long +ds1620_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + int ret; + + mutex_lock(&ds1620_mutex); + ret = ds1620_ioctl(file, cmd, arg); + mutex_unlock(&ds1620_mutex); + + return ret; +} + +#ifdef THERM_USE_PROC +static int ds1620_proc_therm_show(struct seq_file *m, void *v) +{ + struct therm th; + int temp; + + ds1620_read_state(&th); + temp = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9)); + + seq_printf(m, "Thermostat: HI %i.%i, LOW %i.%i; temperature: %i.%i C, fan %s\n", + th.hi >> 1, th.hi & 1 ? 5 : 0, + th.lo >> 1, th.lo & 1 ? 5 : 0, + temp >> 1, temp & 1 ? 5 : 0, + fan_state[netwinder_get_fan()]); + return 0; +} +#endif + +static const struct file_operations ds1620_fops = { + .owner = THIS_MODULE, + .open = ds1620_open, + .read = ds1620_read, + .unlocked_ioctl = ds1620_unlocked_ioctl, + .llseek = no_llseek, +}; + +static struct miscdevice ds1620_miscdev = { + TEMP_MINOR, + "temp", + &ds1620_fops +}; + +static int __init ds1620_init(void) +{ + int ret; + struct therm th, th_start; + + if (!machine_is_netwinder()) + return -ENODEV; + + ds1620_out(THERM_RESET, 0, 0); + ds1620_out(THERM_WRITE_CONFIG, 8, CFG_CPU); + ds1620_out(THERM_START_CONVERT, 0, 0); + + /* + * Trigger the fan to start by setting + * temperature high point low. This kicks + * the fan into action. + */ + ds1620_read_state(&th); + th_start.lo = 0; + th_start.hi = 1; + ds1620_write_state(&th_start); + + msleep(2000); + + ds1620_write_state(&th); + + ret = misc_register(&ds1620_miscdev); + if (ret < 0) + return ret; + +#ifdef THERM_USE_PROC + if (!proc_create_single("therm", 0, NULL, ds1620_proc_therm_show)) + printk(KERN_ERR "therm: unable to register /proc/therm\n"); +#endif + + ds1620_read_state(&th); + ret = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9)); + + printk(KERN_INFO "Thermostat: high %i.%i, low %i.%i, " + "current %i.%i C, fan %s.\n", + th.hi >> 1, th.hi & 1 ? 5 : 0, + th.lo >> 1, th.lo & 1 ? 5 : 0, + ret >> 1, ret & 1 ? 5 : 0, + fan_state[netwinder_get_fan()]); + + return 0; +} + +static void __exit ds1620_exit(void) +{ +#ifdef THERM_USE_PROC + remove_proc_entry("therm", NULL); +#endif + misc_deregister(&ds1620_miscdev); +} + +module_init(ds1620_init); +module_exit(ds1620_exit); + +MODULE_LICENSE("GPL"); -- cgit v1.2.3