1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/**
* twl4030-pwrbutton.c - TWL4030 Power Button Input Driver
*
* Copyright (C) 2008-2009 Nokia Corporation
*
* Written by Peter De Schrijver <peter.de-schrijver@nokia.com>
* Several fixes by Felipe Balbi <felipe.balbi@nokia.com>
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file "COPYING" in the main directory of this
* archive for more details.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/i2c/twl.h>
#define PWR_PWRON_IRQ (1 << 0)
#define STS_HW_CONDITIONS 0xf
static irqreturn_t powerbutton_irq(int irq, void *_pwr)
{
struct input_dev *pwr = _pwr;
int err;
u8 value;
#ifdef CONFIG_LOCKDEP
/* WORKAROUND for lockdep forcing IRQF_DISABLED on us, which
* we don't want and can't tolerate since this is a threaded
* IRQ and can sleep due to the i2c reads it has to issue.
* Although it might be friendlier not to borrow this thread
* context...
*/
local_irq_enable();
#endif
err = twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &value,
STS_HW_CONDITIONS);
if (!err) {
input_report_key(pwr, KEY_POWER, value & PWR_PWRON_IRQ);
input_sync(pwr);
} else {
dev_err(pwr->dev.parent, "twl4030: i2c error %d while reading"
" TWL4030 PM_MASTER STS_HW_CONDITIONS register\n", err);
}
return IRQ_HANDLED;
}
static int __devinit twl4030_pwrbutton_probe(struct platform_device *pdev)
{
struct input_dev *pwr;
int irq = platform_get_irq(pdev, 0);
int err;
pwr = input_allocate_device();
if (!pwr) {
dev_dbg(&pdev->dev, "Can't allocate power button\n");
return -ENOMEM;
}
pwr->evbit[0] = BIT_MASK(EV_KEY);
pwr->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
pwr->name = "twl4030_pwrbutton";
pwr->phys = "twl4030_pwrbutton/input0";
pwr->dev.parent = &pdev->dev;
err = request_irq(irq, powerbutton_irq,
IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
"twl4030_pwrbutton", pwr);
if (err < 0) {
dev_dbg(&pdev->dev, "Can't get IRQ for pwrbutton: %d\n", err);
goto free_input_dev;
}
err = input_register_device(pwr);
if (err) {
dev_dbg(&pdev->dev, "Can't register power button: %d\n", err);
goto free_irq;
}
platform_set_drvdata(pdev, pwr);
return 0;
free_irq:
free_irq(irq, NULL);
free_input_dev:
input_free_device(pwr);
return err;
}
static int __devexit twl4030_pwrbutton_remove(struct platform_device *pdev)
{
struct input_dev *pwr = platform_get_drvdata(pdev);
int irq = platform_get_irq(pdev, 0);
free_irq(irq, pwr);
input_unregister_device(pwr);
return 0;
}
struct platform_driver twl4030_pwrbutton_driver = {
.probe = twl4030_pwrbutton_probe,
.remove = __devexit_p(twl4030_pwrbutton_remove),
.driver = {
.name = "twl4030_pwrbutton",
.owner = THIS_MODULE,
},
};
static int __init twl4030_pwrbutton_init(void)
{
return platform_driver_register(&twl4030_pwrbutton_driver);
}
module_init(twl4030_pwrbutton_init);
static void __exit twl4030_pwrbutton_exit(void)
{
platform_driver_unregister(&twl4030_pwrbutton_driver);
}
module_exit(twl4030_pwrbutton_exit);
MODULE_ALIAS("platform:twl4030_pwrbutton");
MODULE_DESCRIPTION("Triton2 Power Button");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Peter De Schrijver <peter.de-schrijver@nokia.com>");
MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
|
