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