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4795b780 CK |
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> | |
7dfe293c | 24 | #include <linux/module.h> |
4795b780 CK |
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 | ||
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 | ||
47 | static int __init cbe_powerbutton_init(void) | |
48 | { | |
49 | int ret = 0; | |
50 | struct input_dev *dev; | |
51 | ||
71a157e8 | 52 | if (!of_machine_is_compatible("IBM,CBPLUS-1.0")) { |
4795b780 CK |
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 | ||
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>"); |