1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * driver for powerbutton on IBM cell blades
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * (C) Copyright IBM Corp. 2005-2008
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Author: Christian Krafft <krafft@de.ibm.com>
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/input.h>
11*4882a593Smuzhiyun #include <linux/module.h>
12*4882a593Smuzhiyun #include <linux/platform_device.h>
13*4882a593Smuzhiyun #include <asm/pmi.h>
14*4882a593Smuzhiyun #include <asm/prom.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun static struct input_dev *button_dev;
17*4882a593Smuzhiyun static struct platform_device *button_pdev;
18*4882a593Smuzhiyun
cbe_powerbutton_handle_pmi(pmi_message_t pmi_msg)19*4882a593Smuzhiyun static void cbe_powerbutton_handle_pmi(pmi_message_t pmi_msg)
20*4882a593Smuzhiyun {
21*4882a593Smuzhiyun BUG_ON(pmi_msg.type != PMI_TYPE_POWER_BUTTON);
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun input_report_key(button_dev, KEY_POWER, 1);
24*4882a593Smuzhiyun input_sync(button_dev);
25*4882a593Smuzhiyun input_report_key(button_dev, KEY_POWER, 0);
26*4882a593Smuzhiyun input_sync(button_dev);
27*4882a593Smuzhiyun }
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun static struct pmi_handler cbe_pmi_handler = {
30*4882a593Smuzhiyun .type = PMI_TYPE_POWER_BUTTON,
31*4882a593Smuzhiyun .handle_pmi_message = cbe_powerbutton_handle_pmi,
32*4882a593Smuzhiyun };
33*4882a593Smuzhiyun
cbe_powerbutton_init(void)34*4882a593Smuzhiyun static int __init cbe_powerbutton_init(void)
35*4882a593Smuzhiyun {
36*4882a593Smuzhiyun int ret = 0;
37*4882a593Smuzhiyun struct input_dev *dev;
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun if (!of_machine_is_compatible("IBM,CBPLUS-1.0")) {
40*4882a593Smuzhiyun printk(KERN_ERR "%s: Not a cell blade.\n", __func__);
41*4882a593Smuzhiyun ret = -ENODEV;
42*4882a593Smuzhiyun goto out;
43*4882a593Smuzhiyun }
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun dev = input_allocate_device();
46*4882a593Smuzhiyun if (!dev) {
47*4882a593Smuzhiyun ret = -ENOMEM;
48*4882a593Smuzhiyun printk(KERN_ERR "%s: Not enough memory.\n", __func__);
49*4882a593Smuzhiyun goto out;
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun set_bit(EV_KEY, dev->evbit);
53*4882a593Smuzhiyun set_bit(KEY_POWER, dev->keybit);
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun dev->name = "Power Button";
56*4882a593Smuzhiyun dev->id.bustype = BUS_HOST;
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun /* this makes the button look like an acpi power button
59*4882a593Smuzhiyun * no clue whether anyone relies on that though */
60*4882a593Smuzhiyun dev->id.product = 0x02;
61*4882a593Smuzhiyun dev->phys = "LNXPWRBN/button/input0";
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun button_pdev = platform_device_register_simple("power_button", 0, NULL, 0);
64*4882a593Smuzhiyun if (IS_ERR(button_pdev)) {
65*4882a593Smuzhiyun ret = PTR_ERR(button_pdev);
66*4882a593Smuzhiyun goto out_free_input;
67*4882a593Smuzhiyun }
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun dev->dev.parent = &button_pdev->dev;
70*4882a593Smuzhiyun ret = input_register_device(dev);
71*4882a593Smuzhiyun if (ret) {
72*4882a593Smuzhiyun printk(KERN_ERR "%s: Failed to register device\n", __func__);
73*4882a593Smuzhiyun goto out_free_pdev;
74*4882a593Smuzhiyun }
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun button_dev = dev;
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun ret = pmi_register_handler(&cbe_pmi_handler);
79*4882a593Smuzhiyun if (ret) {
80*4882a593Smuzhiyun printk(KERN_ERR "%s: Failed to register with pmi.\n", __func__);
81*4882a593Smuzhiyun goto out_free_pdev;
82*4882a593Smuzhiyun }
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun goto out;
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun out_free_pdev:
87*4882a593Smuzhiyun platform_device_unregister(button_pdev);
88*4882a593Smuzhiyun out_free_input:
89*4882a593Smuzhiyun input_free_device(dev);
90*4882a593Smuzhiyun out:
91*4882a593Smuzhiyun return ret;
92*4882a593Smuzhiyun }
93*4882a593Smuzhiyun
cbe_powerbutton_exit(void)94*4882a593Smuzhiyun static void __exit cbe_powerbutton_exit(void)
95*4882a593Smuzhiyun {
96*4882a593Smuzhiyun pmi_unregister_handler(&cbe_pmi_handler);
97*4882a593Smuzhiyun platform_device_unregister(button_pdev);
98*4882a593Smuzhiyun input_free_device(button_dev);
99*4882a593Smuzhiyun }
100*4882a593Smuzhiyun
101*4882a593Smuzhiyun module_init(cbe_powerbutton_init);
102*4882a593Smuzhiyun module_exit(cbe_powerbutton_exit);
103*4882a593Smuzhiyun
104*4882a593Smuzhiyun MODULE_LICENSE("GPL");
105*4882a593Smuzhiyun MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");
106