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