1 | /** |
2 | * twl4030-pwrbutton.c - TWL4030 Power Button Input Driver |
3 | * |
4 | * Copyright (C) 2008-2009 Nokia Corporation |
5 | * |
6 | * Written by Peter De Schrijver <peter.de-schrijver@nokia.com> |
7 | * Several fixes by Felipe Balbi <felipe.balbi@nokia.com> |
8 | * |
9 | * This file is subject to the terms and conditions of the GNU General |
10 | * Public License. See the file "COPYING" in the main directory of this |
11 | * archive for more details. |
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
21 | */ |
22 | |
23 | #include <linux/module.h> |
24 | #include <linux/init.h> |
25 | #include <linux/kernel.h> |
26 | #include <linux/errno.h> |
27 | #include <linux/input.h> |
28 | #include <linux/interrupt.h> |
29 | #include <linux/of.h> |
30 | #include <linux/platform_device.h> |
31 | #include <linux/mfd/twl.h> |
32 | |
33 | #define PWR_PWRON_IRQ (1 << 0) |
34 | |
35 | #define STS_HW_CONDITIONS 0xf |
36 | |
37 | static irqreturn_t powerbutton_irq(int irq, void *_pwr) |
38 | { |
39 | struct input_dev *pwr = _pwr; |
40 | int err; |
41 | u8 value; |
42 | |
43 | err = twl_i2c_read_u8(mod_no: TWL_MODULE_PM_MASTER, val: &value, STS_HW_CONDITIONS); |
44 | if (!err) { |
45 | pm_wakeup_event(dev: pwr->dev.parent, msec: 0); |
46 | input_report_key(dev: pwr, KEY_POWER, value: value & PWR_PWRON_IRQ); |
47 | input_sync(dev: pwr); |
48 | } else { |
49 | dev_err(pwr->dev.parent, "twl4030: i2c error %d while reading" |
50 | " TWL4030 PM_MASTER STS_HW_CONDITIONS register\n" , err); |
51 | } |
52 | |
53 | return IRQ_HANDLED; |
54 | } |
55 | |
56 | static int twl4030_pwrbutton_probe(struct platform_device *pdev) |
57 | { |
58 | struct input_dev *pwr; |
59 | int irq = platform_get_irq(pdev, 0); |
60 | int err; |
61 | |
62 | pwr = devm_input_allocate_device(&pdev->dev); |
63 | if (!pwr) { |
64 | dev_err(&pdev->dev, "Can't allocate power button\n" ); |
65 | return -ENOMEM; |
66 | } |
67 | |
68 | input_set_capability(dev: pwr, EV_KEY, KEY_POWER); |
69 | pwr->name = "twl4030_pwrbutton" ; |
70 | pwr->phys = "twl4030_pwrbutton/input0" ; |
71 | pwr->dev.parent = &pdev->dev; |
72 | |
73 | err = devm_request_threaded_irq(dev: &pdev->dev, irq, NULL, thread_fn: powerbutton_irq, |
74 | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | |
75 | IRQF_ONESHOT, |
76 | devname: "twl4030_pwrbutton" , dev_id: pwr); |
77 | if (err < 0) { |
78 | dev_err(&pdev->dev, "Can't get IRQ for pwrbutton: %d\n" , err); |
79 | return err; |
80 | } |
81 | |
82 | err = input_register_device(pwr); |
83 | if (err) { |
84 | dev_err(&pdev->dev, "Can't register power button: %d\n" , err); |
85 | return err; |
86 | } |
87 | |
88 | device_init_wakeup(dev: &pdev->dev, enable: true); |
89 | |
90 | return 0; |
91 | } |
92 | |
93 | #ifdef CONFIG_OF |
94 | static const struct of_device_id twl4030_pwrbutton_dt_match_table[] = { |
95 | { .compatible = "ti,twl4030-pwrbutton" }, |
96 | {}, |
97 | }; |
98 | MODULE_DEVICE_TABLE(of, twl4030_pwrbutton_dt_match_table); |
99 | #endif |
100 | |
101 | static struct platform_driver twl4030_pwrbutton_driver = { |
102 | .probe = twl4030_pwrbutton_probe, |
103 | .driver = { |
104 | .name = "twl4030_pwrbutton" , |
105 | .of_match_table = of_match_ptr(twl4030_pwrbutton_dt_match_table), |
106 | }, |
107 | }; |
108 | module_platform_driver(twl4030_pwrbutton_driver); |
109 | |
110 | MODULE_ALIAS("platform:twl4030_pwrbutton" ); |
111 | MODULE_DESCRIPTION("Triton2 Power Button" ); |
112 | MODULE_LICENSE("GPL" ); |
113 | MODULE_AUTHOR("Peter De Schrijver <peter.de-schrijver@nokia.com>" ); |
114 | MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>" ); |
115 | |
116 | |