1 // SPDX-License-Identifier: GPL-2.0-only OR BSD-3-Clause 2 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 19 struct pwr_mlxbf { 20 struct work_struct send_work; 21 const char *hid; 22 }; 23 24 static void pwr_mlxbf_send_work(struct work_struct *work) 25 { 26 acpi_bus_generate_netlink_event("button/power.*", "Power Button", 0x80, 1); 27 } 28 29 static irqreturn_t pwr_mlxbf_irq(int irq, void *ptr) 30 { 31 const char *rst_pwr_hid = "MLNXBF24"; 32 const char *low_pwr_hid = "MLNXBF29"; 33 struct pwr_mlxbf *priv = ptr; 34 35 if (!strncmp(priv->hid, rst_pwr_hid, 8)) 36 emergency_restart(); 37 38 if (!strncmp(priv->hid, low_pwr_hid, 8)) 39 schedule_work(&priv->send_work); 40 41 return IRQ_HANDLED; 42 } 43 44 static 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->send_work, pwr_mlxbf_send_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 78 static const struct acpi_device_id __maybe_unused pwr_mlxbf_acpi_match[] = { 79 { "MLNXBF24", 0 }, 80 { "MLNXBF29", 0 }, 81 {}, 82 }; 83 MODULE_DEVICE_TABLE(acpi, pwr_mlxbf_acpi_match); 84 85 static 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 93 module_platform_driver(pwr_mlxbf_driver); 94 95 MODULE_DESCRIPTION("Mellanox BlueField power driver"); 96 MODULE_AUTHOR("Asmaa Mnebhi <asmaa@nvidia.com>"); 97 MODULE_LICENSE("Dual BSD/GPL"); 98