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 
36 struct 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 */
45 static 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 
60 static 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 		return -EINVAL;
69 
70 	info = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_onkey_info),
71 			    GFP_KERNEL);
72 	if (!info)
73 		return -ENOMEM;
74 	info->chip = chip;
75 	info->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion;
76 	info->dev = &pdev->dev;
77 	info->irq = irq;
78 
79 	info->idev = devm_input_allocate_device(&pdev->dev);
80 	if (!info->idev) {
81 		dev_err(chip->dev, "Failed to allocate input dev\n");
82 		return -ENOMEM;
83 	}
84 
85 	info->idev->name = "88pm860x_on";
86 	info->idev->phys = "88pm860x_on/input0";
87 	info->idev->id.bustype = BUS_I2C;
88 	info->idev->dev.parent = &pdev->dev;
89 	info->idev->evbit[0] = BIT_MASK(EV_KEY);
90 	info->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
91 
92 	ret = input_register_device(info->idev);
93 	if (ret) {
94 		dev_err(chip->dev, "Can't register input device: %d\n", ret);
95 		return ret;
96 	}
97 
98 	ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
99 					pm860x_onkey_handler, IRQF_ONESHOT,
100 					"onkey", info);
101 	if (ret < 0) {
102 		dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
103 			info->irq, ret);
104 		return ret;
105 	}
106 
107 	platform_set_drvdata(pdev, info);
108 	device_init_wakeup(&pdev->dev, 1);
109 
110 	return 0;
111 }
112 
113 static int __maybe_unused pm860x_onkey_suspend(struct device *dev)
114 {
115 	struct platform_device *pdev = to_platform_device(dev);
116 	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
117 
118 	if (device_may_wakeup(dev))
119 		chip->wakeup_flag |= 1 << PM8607_IRQ_ONKEY;
120 	return 0;
121 }
122 static int __maybe_unused pm860x_onkey_resume(struct device *dev)
123 {
124 	struct platform_device *pdev = to_platform_device(dev);
125 	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
126 
127 	if (device_may_wakeup(dev))
128 		chip->wakeup_flag &= ~(1 << PM8607_IRQ_ONKEY);
129 	return 0;
130 }
131 
132 static SIMPLE_DEV_PM_OPS(pm860x_onkey_pm_ops, pm860x_onkey_suspend, pm860x_onkey_resume);
133 
134 static struct platform_driver pm860x_onkey_driver = {
135 	.driver		= {
136 		.name	= "88pm860x-onkey",
137 		.pm	= &pm860x_onkey_pm_ops,
138 	},
139 	.probe		= pm860x_onkey_probe,
140 };
141 module_platform_driver(pm860x_onkey_driver);
142 
143 MODULE_DESCRIPTION("Marvell 88PM860x ONKEY driver");
144 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
145 MODULE_LICENSE("GPL");
146