1 /*
2  * driver for powerbutton on IBM cell blades
3  *
4  * (C) Copyright IBM Corp. 2005-2008
5  *
6  * Author: Christian Krafft <krafft@de.ibm.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2, or (at your option)
11  * any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21  */
22 
23 #include <linux/input.h>
24 #include <linux/platform_device.h>
25 #include <asm/pmi.h>
26 #include <asm/prom.h>
27 
28 static struct input_dev *button_dev;
29 static struct platform_device *button_pdev;
30 
31 static void cbe_powerbutton_handle_pmi(pmi_message_t pmi_msg)
32 {
33 	BUG_ON(pmi_msg.type != PMI_TYPE_POWER_BUTTON);
34 
35 	input_report_key(button_dev, KEY_POWER, 1);
36 	input_sync(button_dev);
37 	input_report_key(button_dev, KEY_POWER, 0);
38 	input_sync(button_dev);
39 }
40 
41 static struct pmi_handler cbe_pmi_handler = {
42 	.type			= PMI_TYPE_POWER_BUTTON,
43 	.handle_pmi_message	= cbe_powerbutton_handle_pmi,
44 };
45 
46 static int __init cbe_powerbutton_init(void)
47 {
48 	int ret = 0;
49 	struct input_dev *dev;
50 
51 	if (!machine_is_compatible("IBM,CBPLUS-1.0")) {
52 		printk(KERN_ERR "%s: Not a cell blade.\n", __func__);
53 		ret = -ENODEV;
54 		goto out;
55 	}
56 
57 	dev = input_allocate_device();
58 	if (!dev) {
59 		ret = -ENOMEM;
60 		printk(KERN_ERR "%s: Not enough memory.\n", __func__);
61 		goto out;
62 	}
63 
64 	set_bit(EV_KEY, dev->evbit);
65 	set_bit(KEY_POWER, dev->keybit);
66 
67 	dev->name = "Power Button";
68 	dev->id.bustype = BUS_HOST;
69 
70 	/* this makes the button look like an acpi power button
71 	 * no clue whether anyone relies on that though */
72 	dev->id.product = 0x02;
73 	dev->phys = "LNXPWRBN/button/input0";
74 
75 	button_pdev = platform_device_register_simple("power_button", 0, NULL, 0);
76 	if (IS_ERR(button_pdev)) {
77 		ret = PTR_ERR(button_pdev);
78 		goto out_free_input;
79 	}
80 
81 	dev->dev.parent = &button_pdev->dev;
82 	ret = input_register_device(dev);
83 	if (ret) {
84 		printk(KERN_ERR "%s: Failed to register device\n", __func__);
85 		goto out_free_pdev;
86 	}
87 
88 	button_dev = dev;
89 
90 	ret = pmi_register_handler(&cbe_pmi_handler);
91 	if (ret) {
92 		printk(KERN_ERR "%s: Failed to register with pmi.\n", __func__);
93 		goto out_free_pdev;
94 	}
95 
96 	goto out;
97 
98 out_free_pdev:
99 	platform_device_unregister(button_pdev);
100 out_free_input:
101 	input_free_device(dev);
102 out:
103 	return ret;
104 }
105 
106 static void __exit cbe_powerbutton_exit(void)
107 {
108 	pmi_unregister_handler(&cbe_pmi_handler);
109 	platform_device_unregister(button_pdev);
110 	input_free_device(button_dev);
111 }
112 
113 module_init(cbe_powerbutton_init);
114 module_exit(cbe_powerbutton_exit);
115 
116 MODULE_LICENSE("GPL");
117 MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");
118