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
pwr_mlxbf_send_work(struct work_struct * work)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
pwr_mlxbf_irq(int irq,void * ptr)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
pwr_mlxbf_probe(struct platform_device * pdev)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