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 reboot_work; 21 struct work_struct shutdown_work; 22 const char *hid; 23 }; 24 25 static void pwr_mlxbf_reboot_work(struct work_struct *work) 26 { 27 acpi_bus_generate_netlink_event("button/reboot.*", "Reboot Button", 0x80, 1); 28 } 29 30 static void pwr_mlxbf_shutdown_work(struct work_struct *work) 31 { 32 acpi_bus_generate_netlink_event("button/power.*", "Power Button", 0x80, 1); 33 } 34 35 static irqreturn_t pwr_mlxbf_irq(int irq, void *ptr) 36 { 37 const char *rst_pwr_hid = "MLNXBF24"; 38 const char *low_pwr_hid = "MLNXBF29"; 39 struct pwr_mlxbf *priv = ptr; 40 41 if (!strncmp(priv->hid, rst_pwr_hid, 8)) 42 schedule_work(&priv->reboot_work); 43 44 if (!strncmp(priv->hid, low_pwr_hid, 8)) 45 schedule_work(&priv->shutdown_work); 46 47 return IRQ_HANDLED; 48 } 49 50 static int pwr_mlxbf_probe(struct platform_device *pdev) 51 { 52 struct device *dev = &pdev->dev; 53 struct acpi_device *adev; 54 struct pwr_mlxbf *priv; 55 const char *hid; 56 int irq, err; 57 58 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 59 if (!priv) 60 return -ENOMEM; 61 62 adev = ACPI_COMPANION(dev); 63 if (!adev) 64 return -ENXIO; 65 66 hid = acpi_device_hid(adev); 67 priv->hid = hid; 68 69 irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 0); 70 if (irq < 0) 71 return dev_err_probe(dev, irq, "Error getting %s irq.\n", priv->hid); 72 73 err = devm_work_autocancel(dev, &priv->shutdown_work, pwr_mlxbf_shutdown_work); 74 if (err) 75 return err; 76 77 err = devm_work_autocancel(dev, &priv->reboot_work, pwr_mlxbf_reboot_work); 78 if (err) 79 return err; 80 81 err = devm_request_irq(dev, irq, pwr_mlxbf_irq, 0, hid, priv); 82 if (err) 83 dev_err(dev, "Failed request of %s irq\n", priv->hid); 84 85 return err; 86 } 87 88 static const struct acpi_device_id __maybe_unused pwr_mlxbf_acpi_match[] = { 89 { "MLNXBF24", 0 }, 90 { "MLNXBF29", 0 }, 91 {}, 92 }; 93 MODULE_DEVICE_TABLE(acpi, pwr_mlxbf_acpi_match); 94 95 static struct platform_driver pwr_mlxbf_driver = { 96 .driver = { 97 .name = "pwr_mlxbf", 98 .acpi_match_table = pwr_mlxbf_acpi_match, 99 }, 100 .probe = pwr_mlxbf_probe, 101 }; 102 103 module_platform_driver(pwr_mlxbf_driver); 104 105 MODULE_DESCRIPTION("Mellanox BlueField power driver"); 106 MODULE_AUTHOR("Asmaa Mnebhi <asmaa@nvidia.com>"); 107 MODULE_LICENSE("Dual BSD/GPL"); 108