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/pwm-fan.c | 682 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 682 insertions(+) create mode 100644 drivers/hwmon/pwm-fan.c (limited to 'drivers/hwmon/pwm-fan.c') diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c new file mode 100644 index 000000000..83a347ca3 --- /dev/null +++ b/drivers/hwmon/pwm-fan.c @@ -0,0 +1,682 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * pwm-fan.c - Hwmon driver for fans connected to PWM lines. + * + * Copyright (c) 2014 Samsung Electronics Co., Ltd. + * + * Author: Kamil Debski + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define MAX_PWM 255 + +struct pwm_fan_tach { + int irq; + atomic_t pulses; + unsigned int rpm; + u8 pulses_per_revolution; +}; + +enum pwm_fan_enable_mode { + pwm_off_reg_off, + pwm_disable_reg_enable, + pwm_enable_reg_enable, + pwm_disable_reg_disable, +}; + +struct pwm_fan_ctx { + struct device *dev; + + struct mutex lock; + struct pwm_device *pwm; + struct pwm_state pwm_state; + struct regulator *reg_en; + enum pwm_fan_enable_mode enable_mode; + bool regulator_enabled; + bool enabled; + + int tach_count; + struct pwm_fan_tach *tachs; + ktime_t sample_start; + struct timer_list rpm_timer; + + unsigned int pwm_value; + unsigned int pwm_fan_state; + unsigned int pwm_fan_max_state; + unsigned int *pwm_fan_cooling_levels; + struct thermal_cooling_device *cdev; + + struct hwmon_chip_info info; + struct hwmon_channel_info fan_channel; +}; + +/* This handler assumes self resetting edge triggered interrupt. */ +static irqreturn_t pulse_handler(int irq, void *dev_id) +{ + struct pwm_fan_tach *tach = dev_id; + + atomic_inc(&tach->pulses); + + return IRQ_HANDLED; +} + +static void sample_timer(struct timer_list *t) +{ + struct pwm_fan_ctx *ctx = from_timer(ctx, t, rpm_timer); + unsigned int delta = ktime_ms_delta(ktime_get(), ctx->sample_start); + int i; + + if (delta) { + for (i = 0; i < ctx->tach_count; i++) { + struct pwm_fan_tach *tach = &ctx->tachs[i]; + int pulses; + + pulses = atomic_read(&tach->pulses); + atomic_sub(pulses, &tach->pulses); + tach->rpm = (unsigned int)(pulses * 1000 * 60) / + (tach->pulses_per_revolution * delta); + } + + ctx->sample_start = ktime_get(); + } + + mod_timer(&ctx->rpm_timer, jiffies + HZ); +} + +static void pwm_fan_enable_mode_2_state(int enable_mode, + struct pwm_state *state, + bool *enable_regulator) +{ + switch (enable_mode) { + case pwm_disable_reg_enable: + /* disable pwm, keep regulator enabled */ + state->enabled = false; + *enable_regulator = true; + break; + case pwm_enable_reg_enable: + /* keep pwm and regulator enabled */ + state->enabled = true; + *enable_regulator = true; + break; + case pwm_off_reg_off: + case pwm_disable_reg_disable: + /* disable pwm and regulator */ + state->enabled = false; + *enable_regulator = false; + } +} + +static int pwm_fan_switch_power(struct pwm_fan_ctx *ctx, bool on) +{ + int ret = 0; + + if (!ctx->reg_en) + return ret; + + if (!ctx->regulator_enabled && on) { + ret = regulator_enable(ctx->reg_en); + if (ret == 0) + ctx->regulator_enabled = true; + } else if (ctx->regulator_enabled && !on) { + ret = regulator_disable(ctx->reg_en); + if (ret == 0) + ctx->regulator_enabled = false; + } + return ret; +} + +static int pwm_fan_power_on(struct pwm_fan_ctx *ctx) +{ + struct pwm_state *state = &ctx->pwm_state; + int ret; + + if (ctx->enabled) + return 0; + + ret = pwm_fan_switch_power(ctx, true); + if (ret < 0) { + dev_err(ctx->dev, "failed to enable power supply\n"); + return ret; + } + + state->enabled = true; + ret = pwm_apply_state(ctx->pwm, state); + if (ret) { + dev_err(ctx->dev, "failed to enable PWM\n"); + goto disable_regulator; + } + + ctx->enabled = true; + + return 0; + +disable_regulator: + pwm_fan_switch_power(ctx, false); + return ret; +} + +static int pwm_fan_power_off(struct pwm_fan_ctx *ctx) +{ + struct pwm_state *state = &ctx->pwm_state; + bool enable_regulator = false; + int ret; + + if (!ctx->enabled) + return 0; + + pwm_fan_enable_mode_2_state(ctx->enable_mode, + state, + &enable_regulator); + + state->enabled = false; + state->duty_cycle = 0; + ret = pwm_apply_state(ctx->pwm, state); + if (ret) { + dev_err(ctx->dev, "failed to disable PWM\n"); + return ret; + } + + pwm_fan_switch_power(ctx, enable_regulator); + + ctx->enabled = false; + + return 0; +} + +static int __set_pwm(struct pwm_fan_ctx *ctx, unsigned long pwm) +{ + struct pwm_state *state = &ctx->pwm_state; + unsigned long period; + int ret = 0; + + if (pwm > 0) { + if (ctx->enable_mode == pwm_off_reg_off) + /* pwm-fan hard disabled */ + return 0; + + period = state->period; + state->duty_cycle = DIV_ROUND_UP(pwm * (period - 1), MAX_PWM); + ret = pwm_apply_state(ctx->pwm, state); + if (ret) + return ret; + ret = pwm_fan_power_on(ctx); + } else { + ret = pwm_fan_power_off(ctx); + } + if (!ret) + ctx->pwm_value = pwm; + + return ret; +} + +static int set_pwm(struct pwm_fan_ctx *ctx, unsigned long pwm) +{ + int ret; + + mutex_lock(&ctx->lock); + ret = __set_pwm(ctx, pwm); + mutex_unlock(&ctx->lock); + + return ret; +} + +static void pwm_fan_update_state(struct pwm_fan_ctx *ctx, unsigned long pwm) +{ + int i; + + for (i = 0; i < ctx->pwm_fan_max_state; ++i) + if (pwm < ctx->pwm_fan_cooling_levels[i + 1]) + break; + + ctx->pwm_fan_state = i; +} + +static int pwm_fan_update_enable(struct pwm_fan_ctx *ctx, long val) +{ + int ret = 0; + int old_val; + + mutex_lock(&ctx->lock); + + if (ctx->enable_mode == val) + goto out; + + old_val = ctx->enable_mode; + ctx->enable_mode = val; + + if (val == 0) { + /* Disable pwm-fan unconditionally */ + if (ctx->enabled) + ret = __set_pwm(ctx, 0); + else + ret = pwm_fan_switch_power(ctx, false); + if (ret) + ctx->enable_mode = old_val; + pwm_fan_update_state(ctx, 0); + } else { + /* + * Change PWM and/or regulator state if currently disabled + * Nothing to do if currently enabled + */ + if (!ctx->enabled) { + struct pwm_state *state = &ctx->pwm_state; + bool enable_regulator = false; + + state->duty_cycle = 0; + pwm_fan_enable_mode_2_state(val, + state, + &enable_regulator); + + pwm_apply_state(ctx->pwm, state); + pwm_fan_switch_power(ctx, enable_regulator); + pwm_fan_update_state(ctx, 0); + } + } +out: + mutex_unlock(&ctx->lock); + + return ret; +} + +static int pwm_fan_write(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long val) +{ + struct pwm_fan_ctx *ctx = dev_get_drvdata(dev); + int ret; + + switch (attr) { + case hwmon_pwm_input: + if (val < 0 || val > MAX_PWM) + return -EINVAL; + ret = set_pwm(ctx, val); + if (ret) + return ret; + pwm_fan_update_state(ctx, val); + break; + case hwmon_pwm_enable: + if (val < 0 || val > 3) + ret = -EINVAL; + else + ret = pwm_fan_update_enable(ctx, val); + + return ret; + default: + return -EOPNOTSUPP; + } + + return 0; +} + +static int pwm_fan_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + struct pwm_fan_ctx *ctx = dev_get_drvdata(dev); + + switch (type) { + case hwmon_pwm: + switch (attr) { + case hwmon_pwm_input: + *val = ctx->pwm_value; + return 0; + case hwmon_pwm_enable: + *val = ctx->enable_mode; + return 0; + } + return -EOPNOTSUPP; + case hwmon_fan: + *val = ctx->tachs[channel].rpm; + return 0; + + default: + return -ENOTSUPP; + } +} + +static umode_t pwm_fan_is_visible(const void *data, + enum hwmon_sensor_types type, + u32 attr, int channel) +{ + switch (type) { + case hwmon_pwm: + return 0644; + + case hwmon_fan: + return 0444; + + default: + return 0; + } +} + +static const struct hwmon_ops pwm_fan_hwmon_ops = { + .is_visible = pwm_fan_is_visible, + .read = pwm_fan_read, + .write = pwm_fan_write, +}; + +/* thermal cooling device callbacks */ +static int pwm_fan_get_max_state(struct thermal_cooling_device *cdev, + unsigned long *state) +{ + struct pwm_fan_ctx *ctx = cdev->devdata; + + if (!ctx) + return -EINVAL; + + *state = ctx->pwm_fan_max_state; + + return 0; +} + +static int pwm_fan_get_cur_state(struct thermal_cooling_device *cdev, + unsigned long *state) +{ + struct pwm_fan_ctx *ctx = cdev->devdata; + + if (!ctx) + return -EINVAL; + + *state = ctx->pwm_fan_state; + + return 0; +} + +static int +pwm_fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state) +{ + struct pwm_fan_ctx *ctx = cdev->devdata; + int ret; + + if (!ctx || (state > ctx->pwm_fan_max_state)) + return -EINVAL; + + if (state == ctx->pwm_fan_state) + return 0; + + ret = set_pwm(ctx, ctx->pwm_fan_cooling_levels[state]); + if (ret) { + dev_err(&cdev->device, "Cannot set pwm!\n"); + return ret; + } + + ctx->pwm_fan_state = state; + + return ret; +} + +static const struct thermal_cooling_device_ops pwm_fan_cooling_ops = { + .get_max_state = pwm_fan_get_max_state, + .get_cur_state = pwm_fan_get_cur_state, + .set_cur_state = pwm_fan_set_cur_state, +}; + +static int pwm_fan_of_get_cooling_data(struct device *dev, + struct pwm_fan_ctx *ctx) +{ + struct device_node *np = dev->of_node; + int num, i, ret; + + if (!of_find_property(np, "cooling-levels", NULL)) + return 0; + + ret = of_property_count_u32_elems(np, "cooling-levels"); + if (ret <= 0) { + dev_err(dev, "Wrong data!\n"); + return ret ? : -EINVAL; + } + + num = ret; + ctx->pwm_fan_cooling_levels = devm_kcalloc(dev, num, sizeof(u32), + GFP_KERNEL); + if (!ctx->pwm_fan_cooling_levels) + return -ENOMEM; + + ret = of_property_read_u32_array(np, "cooling-levels", + ctx->pwm_fan_cooling_levels, num); + if (ret) { + dev_err(dev, "Property 'cooling-levels' cannot be read!\n"); + return ret; + } + + for (i = 0; i < num; i++) { + if (ctx->pwm_fan_cooling_levels[i] > MAX_PWM) { + dev_err(dev, "PWM fan state[%d]:%d > %d\n", i, + ctx->pwm_fan_cooling_levels[i], MAX_PWM); + return -EINVAL; + } + } + + ctx->pwm_fan_max_state = num - 1; + + return 0; +} + +static void pwm_fan_cleanup(void *__ctx) +{ + struct pwm_fan_ctx *ctx = __ctx; + + del_timer_sync(&ctx->rpm_timer); + /* Switch off everything */ + ctx->enable_mode = pwm_disable_reg_disable; + pwm_fan_power_off(ctx); +} + +static int pwm_fan_probe(struct platform_device *pdev) +{ + struct thermal_cooling_device *cdev; + struct device *dev = &pdev->dev; + struct pwm_fan_ctx *ctx; + struct device *hwmon; + int ret; + const struct hwmon_channel_info **channels; + u32 *fan_channel_config; + int channel_count = 1; /* We always have a PWM channel. */ + int i; + + ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + mutex_init(&ctx->lock); + + ctx->dev = &pdev->dev; + ctx->pwm = devm_pwm_get(dev, NULL); + if (IS_ERR(ctx->pwm)) + return dev_err_probe(dev, PTR_ERR(ctx->pwm), "Could not get PWM\n"); + + platform_set_drvdata(pdev, ctx); + + ctx->reg_en = devm_regulator_get_optional(dev, "fan"); + if (IS_ERR(ctx->reg_en)) { + if (PTR_ERR(ctx->reg_en) != -ENODEV) + return PTR_ERR(ctx->reg_en); + + ctx->reg_en = NULL; + } + + pwm_init_state(ctx->pwm, &ctx->pwm_state); + + /* + * set_pwm assumes that MAX_PWM * (period - 1) fits into an unsigned + * long. Check this here to prevent the fan running at a too low + * frequency. + */ + if (ctx->pwm_state.period > ULONG_MAX / MAX_PWM + 1) { + dev_err(dev, "Configured period too big\n"); + return -EINVAL; + } + + ctx->enable_mode = pwm_disable_reg_enable; + + /* + * Set duty cycle to maximum allowed and enable PWM output as well as + * the regulator. In case of error nothing is changed + */ + ret = set_pwm(ctx, MAX_PWM); + if (ret) { + dev_err(dev, "Failed to configure PWM: %d\n", ret); + return ret; + } + timer_setup(&ctx->rpm_timer, sample_timer, 0); + ret = devm_add_action_or_reset(dev, pwm_fan_cleanup, ctx); + if (ret) + return ret; + + ctx->tach_count = platform_irq_count(pdev); + if (ctx->tach_count < 0) + return dev_err_probe(dev, ctx->tach_count, + "Could not get number of fan tachometer inputs\n"); + dev_dbg(dev, "%d fan tachometer inputs\n", ctx->tach_count); + + if (ctx->tach_count) { + channel_count++; /* We also have a FAN channel. */ + + ctx->tachs = devm_kcalloc(dev, ctx->tach_count, + sizeof(struct pwm_fan_tach), + GFP_KERNEL); + if (!ctx->tachs) + return -ENOMEM; + + ctx->fan_channel.type = hwmon_fan; + fan_channel_config = devm_kcalloc(dev, ctx->tach_count + 1, + sizeof(u32), GFP_KERNEL); + if (!fan_channel_config) + return -ENOMEM; + ctx->fan_channel.config = fan_channel_config; + } + + channels = devm_kcalloc(dev, channel_count + 1, + sizeof(struct hwmon_channel_info *), GFP_KERNEL); + if (!channels) + return -ENOMEM; + + channels[0] = HWMON_CHANNEL_INFO(pwm, HWMON_PWM_INPUT | HWMON_PWM_ENABLE); + + for (i = 0; i < ctx->tach_count; i++) { + struct pwm_fan_tach *tach = &ctx->tachs[i]; + u32 ppr = 2; + + tach->irq = platform_get_irq(pdev, i); + if (tach->irq == -EPROBE_DEFER) + return tach->irq; + if (tach->irq > 0) { + ret = devm_request_irq(dev, tach->irq, pulse_handler, 0, + pdev->name, tach); + if (ret) { + dev_err(dev, + "Failed to request interrupt: %d\n", + ret); + return ret; + } + } + + of_property_read_u32_index(dev->of_node, + "pulses-per-revolution", + i, + &ppr); + tach->pulses_per_revolution = ppr; + if (!tach->pulses_per_revolution) { + dev_err(dev, "pulses-per-revolution can't be zero.\n"); + return -EINVAL; + } + + fan_channel_config[i] = HWMON_F_INPUT; + + dev_dbg(dev, "tach%d: irq=%d, pulses_per_revolution=%d\n", + i, tach->irq, tach->pulses_per_revolution); + } + + if (ctx->tach_count > 0) { + ctx->sample_start = ktime_get(); + mod_timer(&ctx->rpm_timer, jiffies + HZ); + + channels[1] = &ctx->fan_channel; + } + + ctx->info.ops = &pwm_fan_hwmon_ops; + ctx->info.info = channels; + + hwmon = devm_hwmon_device_register_with_info(dev, "pwmfan", + ctx, &ctx->info, NULL); + if (IS_ERR(hwmon)) { + dev_err(dev, "Failed to register hwmon device\n"); + return PTR_ERR(hwmon); + } + + ret = pwm_fan_of_get_cooling_data(dev, ctx); + if (ret) + return ret; + + ctx->pwm_fan_state = ctx->pwm_fan_max_state; + if (IS_ENABLED(CONFIG_THERMAL)) { + cdev = devm_thermal_of_cooling_device_register(dev, + dev->of_node, "pwm-fan", ctx, &pwm_fan_cooling_ops); + if (IS_ERR(cdev)) { + ret = PTR_ERR(cdev); + dev_err(dev, + "Failed to register pwm-fan as cooling device: %d\n", + ret); + return ret; + } + ctx->cdev = cdev; + } + + return 0; +} + +static void pwm_fan_shutdown(struct platform_device *pdev) +{ + struct pwm_fan_ctx *ctx = platform_get_drvdata(pdev); + + pwm_fan_cleanup(ctx); +} + +static int pwm_fan_suspend(struct device *dev) +{ + struct pwm_fan_ctx *ctx = dev_get_drvdata(dev); + + return pwm_fan_power_off(ctx); +} + +static int pwm_fan_resume(struct device *dev) +{ + struct pwm_fan_ctx *ctx = dev_get_drvdata(dev); + + return set_pwm(ctx, ctx->pwm_value); +} + +static DEFINE_SIMPLE_DEV_PM_OPS(pwm_fan_pm, pwm_fan_suspend, pwm_fan_resume); + +static const struct of_device_id of_pwm_fan_match[] = { + { .compatible = "pwm-fan", }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_pwm_fan_match); + +static struct platform_driver pwm_fan_driver = { + .probe = pwm_fan_probe, + .shutdown = pwm_fan_shutdown, + .driver = { + .name = "pwm-fan", + .pm = pm_sleep_ptr(&pwm_fan_pm), + .of_match_table = of_pwm_fan_match, + }, +}; + +module_platform_driver(pwm_fan_driver); + +MODULE_AUTHOR("Kamil Debski "); +MODULE_ALIAS("platform:pwm-fan"); +MODULE_DESCRIPTION("PWM FAN driver"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3