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1// SPDX-License-Identifier: GPL-2.0-only OR BSD-3-Clause2 3/*4 * Copyright (c) 2022 NVIDIA CORPORATION & AFFILIATES.5 */6 7#include <linux/acpi.h>8#include <linux/device.h>9#include <linux/devm-helpers.h>10#include <linux/interrupt.h>11#include <linux/kernel.h>12#include <linux/mod_devicetable.h>13#include <linux/module.h>14#include <linux/platform_device.h>15#include <linux/pm.h>16#include <linux/reboot.h>17#include <linux/types.h>18 19struct pwr_mlxbf {20 struct work_struct reboot_work;21 const char *hid;22};23 24static void pwr_mlxbf_reboot_work(struct work_struct *work)25{26 acpi_bus_generate_netlink_event("button/reboot.*", "Reboot Button", 0x80, 1);27}28 29static irqreturn_t pwr_mlxbf_irq(int irq, void *ptr)30{31 const char *rst_pwr_hid = "MLNXBF24";32 const char *shutdown_hid = "MLNXBF29";33 struct pwr_mlxbf *priv = ptr;34 35 if (!strncmp(priv->hid, rst_pwr_hid, 8))36 schedule_work(&priv->reboot_work);37 38 if (!strncmp(priv->hid, shutdown_hid, 8))39 orderly_poweroff(true);40 41 return IRQ_HANDLED;42}43 44static int pwr_mlxbf_probe(struct platform_device *pdev)45{46 struct device *dev = &pdev->dev;47 struct acpi_device *adev;48 struct pwr_mlxbf *priv;49 const char *hid;50 int irq, err;51 52 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);53 if (!priv)54 return -ENOMEM;55 56 adev = ACPI_COMPANION(dev);57 if (!adev)58 return -ENXIO;59 60 hid = acpi_device_hid(adev);61 priv->hid = hid;62 63 irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 0);64 if (irq < 0)65 return dev_err_probe(dev, irq, "Error getting %s irq.\n", priv->hid);66 67 err = devm_work_autocancel(dev, &priv->reboot_work, pwr_mlxbf_reboot_work);68 if (err)69 return err;70 71 err = devm_request_irq(dev, irq, pwr_mlxbf_irq, 0, hid, priv);72 if (err)73 dev_err(dev, "Failed request of %s irq\n", priv->hid);74 75 return err;76}77 78static const struct acpi_device_id __maybe_unused pwr_mlxbf_acpi_match[] = {79 { "MLNXBF24", 0 },80 { "MLNXBF29", 0 },81 {},82};83MODULE_DEVICE_TABLE(acpi, pwr_mlxbf_acpi_match);84 85static struct platform_driver pwr_mlxbf_driver = {86 .driver = {87 .name = "pwr_mlxbf",88 .acpi_match_table = pwr_mlxbf_acpi_match,89 },90 .probe = pwr_mlxbf_probe,91};92 93module_platform_driver(pwr_mlxbf_driver);94 95MODULE_DESCRIPTION("Mellanox BlueField power driver");96MODULE_AUTHOR("Asmaa Mnebhi <asmaa@nvidia.com>");97MODULE_LICENSE("Dual BSD/GPL");98