| 1 | // SPDX-License-Identifier: GPL-2.0-only OR BSD-3-Clause |
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| 2 | |
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| 3 | /* |
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| 4 | * Copyright (c) 2022 NVIDIA CORPORATION & AFFILIATES. |
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| 5 | */ |
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| 6 | |
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| 7 | #include <linux/acpi.h> |
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| 8 | #include <linux/device.h> |
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| 9 | #include <linux/devm-helpers.h> |
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| 10 | #include <linux/interrupt.h> |
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| 11 | #include <linux/kernel.h> |
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| 12 | #include <linux/mod_devicetable.h> |
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| 13 | #include <linux/module.h> |
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| 14 | #include <linux/platform_device.h> |
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| 15 | #include <linux/pm.h> |
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| 16 | #include <linux/reboot.h> |
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| 17 | #include <linux/types.h> |
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| 18 | |
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| 19 | struct pwr_mlxbf { |
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| 20 | struct work_struct reboot_work; |
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| 21 | const char *hid; |
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| 22 | }; |
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| 23 | |
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| 24 | static void pwr_mlxbf_reboot_work(struct work_struct *work) |
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| 25 | { |
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| 26 | acpi_bus_generate_netlink_event("button/reboot.*" , "Reboot Button" , 0x80, 1); |
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| 27 | } |
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| 28 | |
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| 29 | static irqreturn_t pwr_mlxbf_irq(int irq, void *ptr) |
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| 30 | { |
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| 31 | const char *rst_pwr_hid = "MLNXBF24" ; |
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| 32 | const char *shutdown_hid = "MLNXBF29" ; |
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| 33 | struct pwr_mlxbf *priv = ptr; |
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| 34 | |
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| 35 | if (!strncmp(priv->hid, rst_pwr_hid, 8)) |
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| 36 | schedule_work(work: &priv->reboot_work); |
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| 37 | |
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| 38 | if (!strncmp(priv->hid, shutdown_hid, 8)) |
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| 39 | orderly_poweroff(force: true); |
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| 40 | |
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| 41 | return IRQ_HANDLED; |
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| 42 | } |
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| 43 | |
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| 44 | static int pwr_mlxbf_probe(struct platform_device *pdev) |
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| 45 | { |
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| 46 | struct device *dev = &pdev->dev; |
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| 47 | struct acpi_device *adev; |
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| 48 | struct pwr_mlxbf *priv; |
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| 49 | const char *hid; |
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| 50 | int irq, err; |
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| 51 | |
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| 52 | priv = devm_kzalloc(dev, size: sizeof(*priv), GFP_KERNEL); |
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| 53 | if (!priv) |
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| 54 | return -ENOMEM; |
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| 55 | |
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| 56 | adev = ACPI_COMPANION(dev); |
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| 57 | if (!adev) |
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| 58 | return -ENXIO; |
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| 59 | |
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| 60 | hid = acpi_device_hid(device: adev); |
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| 61 | priv->hid = hid; |
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| 62 | |
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| 63 | irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), index: 0); |
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| 64 | if (irq < 0) |
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| 65 | return dev_err_probe(dev, err: irq, fmt: "Error getting %s irq.\n" , priv->hid); |
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| 66 | |
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| 67 | err = devm_work_autocancel(dev, w: &priv->reboot_work, worker: pwr_mlxbf_reboot_work); |
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| 68 | if (err) |
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| 69 | return err; |
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| 70 | |
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| 71 | err = devm_request_irq(dev, irq, handler: pwr_mlxbf_irq, irqflags: 0, devname: hid, dev_id: priv); |
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| 72 | if (err) |
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| 73 | dev_err(dev, "Failed request of %s irq\n" , priv->hid); |
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| 74 | |
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| 75 | return err; |
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| 76 | } |
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| 77 | |
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| 78 | static const struct acpi_device_id __maybe_unused pwr_mlxbf_acpi_match[] = { |
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| 79 | { "MLNXBF24" , 0 }, |
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| 80 | { "MLNXBF29" , 0 }, |
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| 81 | {}, |
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| 82 | }; |
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| 83 | MODULE_DEVICE_TABLE(acpi, pwr_mlxbf_acpi_match); |
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| 84 | |
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| 85 | static struct platform_driver pwr_mlxbf_driver = { |
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| 86 | .driver = { |
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| 87 | .name = "pwr_mlxbf" , |
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| 88 | .acpi_match_table = pwr_mlxbf_acpi_match, |
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| 89 | }, |
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| 90 | .probe = pwr_mlxbf_probe, |
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| 91 | }; |
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| 92 | |
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| 93 | module_platform_driver(pwr_mlxbf_driver); |
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| 94 | |
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| 95 | MODULE_DESCRIPTION("Mellanox BlueField power driver" ); |
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| 96 | MODULE_AUTHOR("Asmaa Mnebhi <asmaa@nvidia.com>" ); |
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| 97 | MODULE_LICENSE("Dual BSD/GPL" ); |
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| 98 | |
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