1/*
2 * 88pm860x_onkey.c - Marvell 88PM860x ONKEY driver
3 *
4 * Copyright (C) 2009-2010 Marvell International Ltd.
5 * Haojian Zhuang <haojian.zhuang@marvell.com>
6 *
7 * This file is subject to the terms and conditions of the GNU General
8 * Public License. See the file "COPYING" in the main directory of this
9 * archive for more details.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/platform_device.h>
24#include <linux/i2c.h>
25#include <linux/input.h>
26#include <linux/interrupt.h>
27#include <linux/mfd/88pm860x.h>
28#include <linux/slab.h>
29#include <linux/device.h>
30
31#define PM8607_WAKEUP 0x0b
32
33#define LONG_ONKEY_EN (1 << 1)
34#define ONKEY_STATUS (1 << 0)
35
36struct pm860x_onkey_info {
37 struct input_dev *idev;
38 struct pm860x_chip *chip;
39 struct i2c_client *i2c;
40 struct device *dev;
41 int irq;
42};
43
44/* 88PM860x gives us an interrupt when ONKEY is held */
45static irqreturn_t pm860x_onkey_handler(int irq, void *data)
46{
47 struct pm860x_onkey_info *info = data;
48 int ret;
49
50 ret = pm860x_reg_read(info->i2c, PM8607_STATUS_2);
51 ret &= ONKEY_STATUS;
52 input_report_key(info->idev, KEY_POWER, ret);
53 input_sync(info->idev);
54
55 /* Enable 8-second long onkey detection */
56 pm860x_set_bits(info->i2c, PM8607_WAKEUP, 3, LONG_ONKEY_EN);
57 return IRQ_HANDLED;
58}
59
60static int pm860x_onkey_probe(struct platform_device *pdev)
61{
62 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
63 struct pm860x_onkey_info *info;
64 int irq, ret;
65
66 irq = platform_get_irq(pdev, 0);
67 if (irq < 0) {
68 dev_err(&pdev->dev, "No IRQ resource!\n");
69 return -EINVAL;
70 }
71
72 info = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_onkey_info),
73 GFP_KERNEL);
74 if (!info)
75 return -ENOMEM;
76 info->chip = chip;
77 info->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion;
78 info->dev = &pdev->dev;
79 info->irq = irq;
80
81 info->idev = devm_input_allocate_device(&pdev->dev);
82 if (!info->idev) {
83 dev_err(chip->dev, "Failed to allocate input dev\n");
84 return -ENOMEM;
85 }
86
87 info->idev->name = "88pm860x_on";
88 info->idev->phys = "88pm860x_on/input0";
89 info->idev->id.bustype = BUS_I2C;
90 info->idev->dev.parent = &pdev->dev;
91 info->idev->evbit[0] = BIT_MASK(EV_KEY);
92 info->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
93
94 ret = input_register_device(info->idev);
95 if (ret) {
96 dev_err(chip->dev, "Can't register input device: %d\n", ret);
97 return ret;
98 }
99
100 ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
101 pm860x_onkey_handler, IRQF_ONESHOT,
102 "onkey", info);
103 if (ret < 0) {
104 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
105 info->irq, ret);
106 return ret;
107 }
108
109 platform_set_drvdata(pdev, info);
110 device_init_wakeup(&pdev->dev, 1);
111
112 return 0;
113}
114
115static int __maybe_unused pm860x_onkey_suspend(struct device *dev)
116{
117 struct platform_device *pdev = to_platform_device(dev);
118 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
119
120 if (device_may_wakeup(dev))
121 chip->wakeup_flag |= 1 << PM8607_IRQ_ONKEY;
122 return 0;
123}
124static int __maybe_unused pm860x_onkey_resume(struct device *dev)
125{
126 struct platform_device *pdev = to_platform_device(dev);
127 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
128
129 if (device_may_wakeup(dev))
130 chip->wakeup_flag &= ~(1 << PM8607_IRQ_ONKEY);
131 return 0;
132}
133
134static SIMPLE_DEV_PM_OPS(pm860x_onkey_pm_ops, pm860x_onkey_suspend, pm860x_onkey_resume);
135
136static struct platform_driver pm860x_onkey_driver = {
137 .driver = {
138 .name = "88pm860x-onkey",
139 .pm = &pm860x_onkey_pm_ops,
140 },
141 .probe = pm860x_onkey_probe,
142};
143module_platform_driver(pm860x_onkey_driver);
144
145MODULE_DESCRIPTION("Marvell 88PM860x ONKEY driver");
146MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
147MODULE_LICENSE("GPL");
148