1 /*
2  * Marvell 88PM80x ONKEY driver
3  *
4  * Copyright (C) 2012 Marvell International Ltd.
5  * Haojian Zhuang <haojian.zhuang@marvell.com>
6  * Qiao Zhou <zhouqiao@marvell.com>
7  *
8  * This file is subject to the terms and conditions of the GNU General
9  * Public License. See the file "COPYING" in the main directory of this
10  * archive for more details.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20  */
21 
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/input.h>
25 #include <linux/mfd/88pm80x.h>
26 #include <linux/regmap.h>
27 #include <linux/slab.h>
28 
29 #define PM800_LONG_ONKEY_EN		(1 << 0)
30 #define PM800_LONG_KEY_DELAY		(8)	/* 1 .. 16 seconds */
31 #define PM800_LONKEY_PRESS_TIME		((PM800_LONG_KEY_DELAY-1) << 4)
32 #define PM800_LONKEY_PRESS_TIME_MASK	(0xF0)
33 #define PM800_SW_PDOWN			(1 << 5)
34 
35 struct pm80x_onkey_info {
36 	struct input_dev *idev;
37 	struct pm80x_chip *pm80x;
38 	struct regmap *map;
39 	int irq;
40 };
41 
42 /* 88PM80x gives us an interrupt when ONKEY is held */
43 static irqreturn_t pm80x_onkey_handler(int irq, void *data)
44 {
45 	struct pm80x_onkey_info *info = data;
46 	int ret = 0;
47 	unsigned int val;
48 
49 	ret = regmap_read(info->map, PM800_STATUS_1, &val);
50 	if (ret < 0) {
51 		dev_err(info->idev->dev.parent, "failed to read status: %d\n", ret);
52 		return IRQ_NONE;
53 	}
54 	val &= PM800_ONKEY_STS1;
55 
56 	input_report_key(info->idev, KEY_POWER, val);
57 	input_sync(info->idev);
58 
59 	return IRQ_HANDLED;
60 }
61 
62 static SIMPLE_DEV_PM_OPS(pm80x_onkey_pm_ops, pm80x_dev_suspend,
63 			 pm80x_dev_resume);
64 
65 static int pm80x_onkey_probe(struct platform_device *pdev)
66 {
67 
68 	struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent);
69 	struct pm80x_onkey_info *info;
70 	int err;
71 
72 	info = kzalloc(sizeof(struct pm80x_onkey_info), GFP_KERNEL);
73 	if (!info)
74 		return -ENOMEM;
75 
76 	info->pm80x = chip;
77 
78 	info->irq = platform_get_irq(pdev, 0);
79 	if (info->irq < 0) {
80 		dev_err(&pdev->dev, "No IRQ resource!\n");
81 		err = -EINVAL;
82 		goto out;
83 	}
84 
85 	info->map = info->pm80x->regmap;
86 	if (!info->map) {
87 		dev_err(&pdev->dev, "no regmap!\n");
88 		err = -EINVAL;
89 		goto out;
90 	}
91 
92 	info->idev = input_allocate_device();
93 	if (!info->idev) {
94 		dev_err(&pdev->dev, "Failed to allocate input dev\n");
95 		err = -ENOMEM;
96 		goto out;
97 	}
98 
99 	info->idev->name = "88pm80x_on";
100 	info->idev->phys = "88pm80x_on/input0";
101 	info->idev->id.bustype = BUS_I2C;
102 	info->idev->dev.parent = &pdev->dev;
103 	info->idev->evbit[0] = BIT_MASK(EV_KEY);
104 	__set_bit(KEY_POWER, info->idev->keybit);
105 
106 	err = pm80x_request_irq(info->pm80x, info->irq, pm80x_onkey_handler,
107 					    IRQF_ONESHOT, "onkey", info);
108 	if (err < 0) {
109 		dev_err(&pdev->dev, "Failed to request IRQ: #%d: %d\n",
110 			info->irq, err);
111 		goto out_reg;
112 	}
113 
114 	err = input_register_device(info->idev);
115 	if (err) {
116 		dev_err(&pdev->dev, "Can't register input device: %d\n", err);
117 		goto out_irq;
118 	}
119 
120 	platform_set_drvdata(pdev, info);
121 
122 	/* Enable long onkey detection */
123 	regmap_update_bits(info->map, PM800_RTC_MISC4, PM800_LONG_ONKEY_EN,
124 			   PM800_LONG_ONKEY_EN);
125 	/* Set 8-second interval */
126 	regmap_update_bits(info->map, PM800_RTC_MISC3,
127 			   PM800_LONKEY_PRESS_TIME_MASK,
128 			   PM800_LONKEY_PRESS_TIME);
129 
130 	device_init_wakeup(&pdev->dev, 1);
131 	return 0;
132 
133 out_irq:
134 	pm80x_free_irq(info->pm80x, info->irq, info);
135 out_reg:
136 	input_free_device(info->idev);
137 out:
138 	kfree(info);
139 	return err;
140 }
141 
142 static int pm80x_onkey_remove(struct platform_device *pdev)
143 {
144 	struct pm80x_onkey_info *info = platform_get_drvdata(pdev);
145 
146 	device_init_wakeup(&pdev->dev, 0);
147 	pm80x_free_irq(info->pm80x, info->irq, info);
148 	input_unregister_device(info->idev);
149 	kfree(info);
150 	return 0;
151 }
152 
153 static struct platform_driver pm80x_onkey_driver = {
154 	.driver = {
155 		   .name = "88pm80x-onkey",
156 		   .owner = THIS_MODULE,
157 		   .pm = &pm80x_onkey_pm_ops,
158 		   },
159 	.probe = pm80x_onkey_probe,
160 	.remove = pm80x_onkey_remove,
161 };
162 
163 module_platform_driver(pm80x_onkey_driver);
164 
165 MODULE_LICENSE("GPL");
166 MODULE_DESCRIPTION("Marvell 88PM80x ONKEY driver");
167 MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
168 MODULE_ALIAS("platform:88pm80x-onkey");
169