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
19struct pwr_mlxbf {
20 struct work_struct reboot_work;
21 struct work_struct shutdown_work;
22 const char *hid;
23};
24
25static void pwr_mlxbf_reboot_work(struct work_struct *work)
26{
27 acpi_bus_generate_netlink_event("button/reboot.*", "Reboot Button", 0x80, 1);
28}
29
30static void pwr_mlxbf_shutdown_work(struct work_struct *work)
31{
32 acpi_bus_generate_netlink_event("button/power.*", "Power Button", 0x80, 1);
33}
34
35static 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(work: &priv->reboot_work);
43
44 if (!strncmp(priv->hid, low_pwr_hid, 8))
45 schedule_work(work: &priv->shutdown_work);
46
47 return IRQ_HANDLED;
48}
49
50static 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, size: 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(device: adev);
67 priv->hid = hid;
68
69 irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), index: 0);
70 if (irq < 0)
71 return dev_err_probe(dev, err: irq, fmt: "Error getting %s irq.\n", priv->hid);
72
73 err = devm_work_autocancel(dev, w: &priv->shutdown_work, worker: pwr_mlxbf_shutdown_work);
74 if (err)
75 return err;
76
77 err = devm_work_autocancel(dev, w: &priv->reboot_work, worker: pwr_mlxbf_reboot_work);
78 if (err)
79 return err;
80
81 err = devm_request_irq(dev, irq, handler: pwr_mlxbf_irq, irqflags: 0, devname: hid, dev_id: priv);
82 if (err)
83 dev_err(dev, "Failed request of %s irq\n", priv->hid);
84
85 return err;
86}
87
88static const struct acpi_device_id __maybe_unused pwr_mlxbf_acpi_match[] = {
89 { "MLNXBF24", 0 },
90 { "MLNXBF29", 0 },
91 {},
92};
93MODULE_DEVICE_TABLE(acpi, pwr_mlxbf_acpi_match);
94
95static 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
103module_platform_driver(pwr_mlxbf_driver);
104
105MODULE_DESCRIPTION("Mellanox BlueField power driver");
106MODULE_AUTHOR("Asmaa Mnebhi <asmaa@nvidia.com>");
107MODULE_LICENSE("Dual BSD/GPL");
108

source code of linux/drivers/power/reset/pwr-mlxbf.c