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 		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 
115 static 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 }
124 static 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 
134 static SIMPLE_DEV_PM_OPS(pm860x_onkey_pm_ops, pm860x_onkey_suspend, pm860x_onkey_resume);
135 
136 static 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 };
143 module_platform_driver(pm860x_onkey_driver);
144 
145 MODULE_DESCRIPTION("Marvell 88PM860x ONKEY driver");
146 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
147 MODULE_LICENSE("GPL");
148