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/module.h>
25 #include <linux/platform_device.h>
26 #include <asm/pmi.h>
27 #include <asm/prom.h>
28
29 static struct input_dev *button_dev;
30 static struct platform_device *button_pdev;
31
cbe_powerbutton_handle_pmi(pmi_message_t pmi_msg)32 static void cbe_powerbutton_handle_pmi(pmi_message_t pmi_msg)
33 {
34 BUG_ON(pmi_msg.type != PMI_TYPE_POWER_BUTTON);
35
36 input_report_key(button_dev, KEY_POWER, 1);
37 input_sync(button_dev);
38 input_report_key(button_dev, KEY_POWER, 0);
39 input_sync(button_dev);
40 }
41
42 static struct pmi_handler cbe_pmi_handler = {
43 .type = PMI_TYPE_POWER_BUTTON,
44 .handle_pmi_message = cbe_powerbutton_handle_pmi,
45 };
46
cbe_powerbutton_init(void)47 static int __init cbe_powerbutton_init(void)
48 {
49 int ret = 0;
50 struct input_dev *dev;
51
52 if (!of_machine_is_compatible("IBM,CBPLUS-1.0")) {
53 printk(KERN_ERR "%s: Not a cell blade.\n", __func__);
54 ret = -ENODEV;
55 goto out;
56 }
57
58 dev = input_allocate_device();
59 if (!dev) {
60 ret = -ENOMEM;
61 printk(KERN_ERR "%s: Not enough memory.\n", __func__);
62 goto out;
63 }
64
65 set_bit(EV_KEY, dev->evbit);
66 set_bit(KEY_POWER, dev->keybit);
67
68 dev->name = "Power Button";
69 dev->id.bustype = BUS_HOST;
70
71 /* this makes the button look like an acpi power button
72 * no clue whether anyone relies on that though */
73 dev->id.product = 0x02;
74 dev->phys = "LNXPWRBN/button/input0";
75
76 button_pdev = platform_device_register_simple("power_button", 0, NULL, 0);
77 if (IS_ERR(button_pdev)) {
78 ret = PTR_ERR(button_pdev);
79 goto out_free_input;
80 }
81
82 dev->dev.parent = &button_pdev->dev;
83 ret = input_register_device(dev);
84 if (ret) {
85 printk(KERN_ERR "%s: Failed to register device\n", __func__);
86 goto out_free_pdev;
87 }
88
89 button_dev = dev;
90
91 ret = pmi_register_handler(&cbe_pmi_handler);
92 if (ret) {
93 printk(KERN_ERR "%s: Failed to register with pmi.\n", __func__);
94 goto out_free_pdev;
95 }
96
97 goto out;
98
99 out_free_pdev:
100 platform_device_unregister(button_pdev);
101 out_free_input:
102 input_free_device(dev);
103 out:
104 return ret;
105 }
106
cbe_powerbutton_exit(void)107 static void __exit cbe_powerbutton_exit(void)
108 {
109 pmi_unregister_handler(&cbe_pmi_handler);
110 platform_device_unregister(button_pdev);
111 input_free_device(button_dev);
112 }
113
114 module_init(cbe_powerbutton_init);
115 module_exit(cbe_powerbutton_exit);
116
117 MODULE_LICENSE("GPL");
118 MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");
119