1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * driver for powerbutton on IBM cell blades
4 *
5 * (C) Copyright IBM Corp. 2005-2008
6 *
7 * Author: Christian Krafft <krafft@de.ibm.com>
8 */
9
10#include <linux/input.h>
11#include <linux/module.h>
12#include <linux/of.h>
13#include <linux/platform_device.h>
14#include <asm/pmi.h>
15
16static struct input_dev *button_dev;
17static struct platform_device *button_pdev;
18
19static void cbe_powerbutton_handle_pmi(pmi_message_t pmi_msg)
20{
21	BUG_ON(pmi_msg.type != PMI_TYPE_POWER_BUTTON);
22
23	input_report_key(button_dev, KEY_POWER, 1);
24	input_sync(button_dev);
25	input_report_key(button_dev, KEY_POWER, 0);
26	input_sync(button_dev);
27}
28
29static struct pmi_handler cbe_pmi_handler = {
30	.type			= PMI_TYPE_POWER_BUTTON,
31	.handle_pmi_message	= cbe_powerbutton_handle_pmi,
32};
33
34static int __init cbe_powerbutton_init(void)
35{
36	int ret = 0;
37	struct input_dev *dev;
38
39	if (!of_machine_is_compatible("IBM,CBPLUS-1.0")) {
40		printk(KERN_ERR "%s: Not a cell blade.\n", __func__);
41		ret = -ENODEV;
42		goto out;
43	}
44
45	dev = input_allocate_device();
46	if (!dev) {
47		ret = -ENOMEM;
48		printk(KERN_ERR "%s: Not enough memory.\n", __func__);
49		goto out;
50	}
51
52	set_bit(EV_KEY, dev->evbit);
53	set_bit(KEY_POWER, dev->keybit);
54
55	dev->name = "Power Button";
56	dev->id.bustype = BUS_HOST;
57
58	/* this makes the button look like an acpi power button
59	 * no clue whether anyone relies on that though */
60	dev->id.product = 0x02;
61	dev->phys = "LNXPWRBN/button/input0";
62
63	button_pdev = platform_device_register_simple("power_button", 0, NULL, 0);
64	if (IS_ERR(button_pdev)) {
65		ret = PTR_ERR(button_pdev);
66		goto out_free_input;
67	}
68
69	dev->dev.parent = &button_pdev->dev;
70	ret = input_register_device(dev);
71	if (ret) {
72		printk(KERN_ERR "%s: Failed to register device\n", __func__);
73		goto out_free_pdev;
74	}
75
76	button_dev = dev;
77
78	ret = pmi_register_handler(&cbe_pmi_handler);
79	if (ret) {
80		printk(KERN_ERR "%s: Failed to register with pmi.\n", __func__);
81		goto out_free_pdev;
82	}
83
84	goto out;
85
86out_free_pdev:
87	platform_device_unregister(button_pdev);
88out_free_input:
89	input_free_device(dev);
90out:
91	return ret;
92}
93
94static void __exit cbe_powerbutton_exit(void)
95{
96	pmi_unregister_handler(&cbe_pmi_handler);
97	platform_device_unregister(button_pdev);
98	input_free_device(button_dev);
99}
100
101module_init(cbe_powerbutton_init);
102module_exit(cbe_powerbutton_exit);
103
104MODULE_LICENSE("GPL");
105MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");
106