// SPDX-License-Identifier: GPL-2.0-only or BSD-3-Clause /* * Copyright (c) 2022 NVIDIA CORPORATION & AFFILIATES. */ #include <linux/acpi.h> #include <linux/device.h> #include <linux/devm-helpers.h> #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/pm.h> #include <linux/reboot.h> #include <linux/types.h> struct pwr_mlxbf { struct work_struct send_work; const char *hid; }; static void pwr_mlxbf_send_work(struct work_struct *work) { acpi_bus_generate_netlink_event("button/power.*", "Power Button", 0x80, 1); } static irqreturn_t pwr_mlxbf_irq(int irq, void *ptr) { const char *rst_pwr_hid = "MLNXBF24"; const char *low_pwr_hid = "MLNXBF29"; struct pwr_mlxbf *priv = ptr; if (!strncmp(priv->hid, rst_pwr_hid, 8)) emergency_restart(); if (!strncmp(priv->hid, low_pwr_hid, 8)) schedule_work(&priv->send_work); return IRQ_HANDLED; } static int pwr_mlxbf_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct acpi_device *adev; struct pwr_mlxbf *priv; const char *hid; int irq, err; priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; adev = ACPI_COMPANION(dev); if (!adev) return -ENXIO; hid = acpi_device_hid(adev); priv->hid = hid; irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 0); if (irq < 0) return dev_err_probe(dev, irq, "Error getting %s irq.\n", priv->hid); err = devm_work_autocancel(dev, &priv->send_work, pwr_mlxbf_send_work); if (err) return err; err = devm_request_irq(dev, irq, pwr_mlxbf_irq, 0, hid, priv); if (err) dev_err(dev, "Failed request of %s irq\n", priv->hid); return err; } static const struct acpi_device_id __maybe_unused pwr_mlxbf_acpi_match[] = { { "MLNXBF24", 0 }, { "MLNXBF29", 0 }, {}, }; MODULE_DEVICE_TABLE(acpi, pwr_mlxbf_acpi_match); static struct platform_driver pwr_mlxbf_driver = { .driver = { .name = "pwr_mlxbf", .acpi_match_table = pwr_mlxbf_acpi_match, }, .probe = pwr_mlxbf_probe, }; module_platform_driver(pwr_mlxbf_driver); MODULE_DESCRIPTION("Mellanox BlueField power driver"); MODULE_AUTHOR("Asmaa Mnebhi <asmaa@nvidia.com>"); MODULE_LICENSE("Dual BSD/GPL");